diff --git a/_maps/map_files/debug/multiz.dmm b/_maps/map_files/debug/multiz.dmm
new file mode 100644
index 0000000000..43d06e57e1
--- /dev/null
+++ b/_maps/map_files/debug/multiz.dmm
@@ -0,0 +1,10142 @@
+//MAP CONVERTED BY dmm2tgm.py THIS HEADER COMMENT PREVENTS RECONVERSION, DO NOT REMOVE
+"aa" = (
+/turf/open/space/basic,
+/area/space)
+"ab" = (
+/obj/structure/lattice,
+/turf/open/space,
+/area/space)
+"ac" = (
+/turf/open/space,
+/area/space/nearstation)
+"ad" = (
+/turf/closed/wall/r_wall,
+/area/maintenance/department/bridge)
+"ae" = (
+/obj/structure/lattice,
+/obj/structure/grille,
+/turf/open/space,
+/area/space/nearstation)
+"af" = (
+/turf/open/floor/plating,
+/area/maintenance/department/bridge)
+"ag" = (
+/obj/structure/lattice,
+/turf/open/space,
+/area/space/nearstation)
+"ah" = (
+/turf/closed/wall/r_wall,
+/area/engine/atmos)
+"ai" = (
+/obj/machinery/power/rtg/advanced,
+/turf/open/floor/plating/airless,
+/area/space/nearstation)
+"aj" = (
+/turf/closed/wall/r_wall,
+/area/engine/engineering)
+"ak" = (
+/turf/closed/wall/r_wall,
+/area/engine/gravity_generator)
+"al" = (
+/obj/machinery/airalarm{
+	frequency = 1439;
+	locked = 0;
+	pixel_y = 23
+	},
+/obj/structure/closet/secure_closet/atmospherics,
+/turf/open/floor/plating,
+/area/engine/atmos)
+"am" = (
+/obj/machinery/atmospherics/components/unary/tank/air,
+/turf/open/floor/plating,
+/area/engine/atmos)
+"an" = (
+/obj/structure/lattice/catwalk,
+/obj/structure/cable{
+	icon_state = "1-4"
+	},
+/turf/open/space,
+/area/space/nearstation)
+"ao" = (
+/obj/structure/lattice/catwalk,
+/obj/structure/cable{
+	icon_state = "1-2"
+	},
+/obj/structure/cable{
+	icon_state = "2-8"
+	},
+/turf/open/space,
+/area/space/nearstation)
+"ap" = (
+/obj/machinery/airalarm{
+	frequency = 1439;
+	locked = 0;
+	pixel_y = 23
+	},
+/obj/machinery/power/apc{
+	dir = 8;
+	pixel_x = -24
+	},
+/obj/structure/closet/secure_closet/engineering_electrical,
+/obj/structure/cable{
+	icon_state = "0-4"
+	},
+/turf/open/floor/plasteel,
+/area/engine/engineering)
+"aq" = (
+/obj/machinery/computer/monitor,
+/obj/structure/cable{
+	icon_state = "2-8"
+	},
+/turf/open/floor/plasteel,
+/area/engine/engineering)
+"ar" = (
+/obj/structure/closet/secure_closet/engineering_welding,
+/turf/open/floor/plasteel,
+/area/engine/engineering)
+"as" = (
+/obj/machinery/power/smes{
+	charge = 5e+006
+	},
+/obj/machinery/airalarm{
+	frequency = 1439;
+	locked = 0;
+	pixel_y = 23
+	},
+/obj/structure/cable{
+	icon_state = "0-4"
+	},
+/obj/effect/turf_decal/stripes/line{
+	dir = 9
+	},
+/turf/open/floor/plasteel,
+/area/engine/gravity_generator)
+"at" = (
+/obj/machinery/power/apc{
+	dir = 1;
+	name = "Gravity Generator APC";
+	pixel_y = 25
+	},
+/obj/structure/cable{
+	icon_state = "0-8"
+	},
+/obj/structure/cable{
+	icon_state = "0-2"
+	},
+/obj/effect/turf_decal/stripes/line{
+	dir = 5
+	},
+/turf/open/floor/plasteel,
+/area/engine/gravity_generator)
+"au" = (
+/turf/open/openspace,
+/area/security)
+"av" = (
+/obj/machinery/light{
+	dir = 8
+	},
+/turf/open/openspace,
+/area/security)
+"aw" = (
+/turf/open/floor/plating,
+/area/engine/atmos)
+"ax" = (
+/obj/machinery/atmospherics/pipe/simple/supply/hidden{
+	dir = 5
+	},
+/turf/open/floor/plating,
+/area/engine/atmos)
+"ay" = (
+/obj/machinery/atmospherics/pipe/manifold/supply/hidden,
+/turf/open/floor/plating,
+/area/engine/atmos)
+"az" = (
+/obj/machinery/atmospherics/pipe/manifold/supply/hidden{
+	dir = 4
+	},
+/obj/machinery/meter,
+/turf/open/floor/plating,
+/area/engine/atmos)
+"aA" = (
+/obj/structure/lattice/catwalk,
+/obj/structure/cable{
+	icon_state = "4-8"
+	},
+/obj/structure/cable{
+	icon_state = "1-4"
+	},
+/obj/structure/cable{
+	icon_state = "2-4"
+	},
+/turf/open/space,
+/area/space/nearstation)
+"aB" = (
+/obj/structure/lattice/catwalk,
+/obj/structure/cable{
+	icon_state = "4-8"
+	},
+/turf/open/space,
+/area/space/nearstation)
+"aC" = (
+/obj/effect/spawner/structure/window/reinforced,
+/turf/open/openspace,
+/area/security)
+"aD" = (
+/obj/structure/cable{
+	icon_state = "4-8"
+	},
+/obj/structure/fans/tiny,
+/turf/open/floor/plasteel,
+/area/engine/engineering)
+"aE" = (
+/obj/structure/cable{
+	icon_state = "1-2"
+	},
+/obj/structure/cable{
+	icon_state = "2-8"
+	},
+/turf/open/floor/plasteel,
+/area/engine/engineering)
+"aG" = (
+/obj/machinery/power/terminal{
+	dir = 1
+	},
+/obj/machinery/light{
+	dir = 8
+	},
+/obj/effect/turf_decal/stripes/line{
+	dir = 8
+	},
+/turf/open/floor/plasteel,
+/area/engine/gravity_generator)
+"aH" = (
+/obj/structure/cable{
+	icon_state = "1-2"
+	},
+/obj/effect/turf_decal/stripes/line{
+	dir = 4
+	},
+/turf/open/floor/plasteel,
+/area/engine/gravity_generator)
+"aI" = (
+/obj/effect/spawner/structure/window/reinforced,
+/turf/open/floor/plating,
+/area/engine/gravity_generator)
+"aJ" = (
+/turf/open/floor/plasteel{
+	dir = 1
+	},
+/area/engine/gravity_generator)
+"aK" = (
+/turf/open/floor/plasteel{
+	dir = 8
+	},
+/area/engine/gravity_generator)
+"aL" = (
+/turf/open/floor/plasteel{
+	dir = 4
+	},
+/area/engine/gravity_generator)
+"aM" = (
+/obj/machinery/suit_storage_unit/ce,
+/turf/open/floor/plating,
+/area/engine/atmos)
+"aN" = (
+/obj/machinery/atmospherics/components/unary/portables_connector/visible{
+	dir = 4
+	},
+/obj/machinery/portable_atmospherics/canister/nitrous_oxide,
+/obj/effect/turf_decal/bot{
+	dir = 2
+	},
+/turf/open/floor/plasteel{
+	dir = 2
+	},
+/area/engine/atmos)
+"aO" = (
+/obj/machinery/atmospherics/components/binary/pump{
+	dir = 4;
+	on = 1
+	},
+/turf/open/floor/plasteel,
+/area/engine/atmos)
+"aP" = (
+/obj/machinery/atmospherics/pipe/manifold/supply/hidden{
+	dir = 4
+	},
+/turf/open/floor/plating,
+/area/engine/atmos)
+"aQ" = (
+/obj/structure/lattice/catwalk,
+/obj/structure/cable{
+	icon_state = "2-4"
+	},
+/turf/open/space,
+/area/space/nearstation)
+"aR" = (
+/obj/structure/lattice/catwalk,
+/obj/structure/cable{
+	icon_state = "1-8"
+	},
+/obj/structure/cable{
+	icon_state = "1-2"
+	},
+/turf/open/space,
+/area/space/nearstation)
+"aS" = (
+/obj/structure/table,
+/obj/item/flashlight{
+	pixel_y = 5
+	},
+/obj/item/airlock_painter,
+/turf/open/floor/plating,
+/area/engine/engineering)
+"aT" = (
+/obj/structure/cable{
+	icon_state = "1-2"
+	},
+/obj/structure/cable{
+	icon_state = "2-4"
+	},
+/turf/open/floor/plasteel,
+/area/engine/engineering)
+"aU" = (
+/obj/structure/cable{
+	icon_state = "4-8"
+	},
+/turf/open/floor/plasteel,
+/area/engine/gravity_generator)
+"aV" = (
+/obj/structure/cable{
+	icon_state = "4-8"
+	},
+/obj/effect/turf_decal/stripes/line{
+	dir = 8
+	},
+/turf/open/floor/plasteel,
+/area/engine/gravity_generator)
+"aW" = (
+/obj/structure/cable{
+	icon_state = "1-8"
+	},
+/obj/effect/turf_decal/stripes/line{
+	dir = 4
+	},
+/turf/open/floor/plasteel,
+/area/engine/gravity_generator)
+"aX" = (
+/obj/machinery/gravity_generator/main/station,
+/turf/open/openspace,
+/area/security)
+"aY" = (
+/obj/machinery/light{
+	dir = 4
+	},
+/turf/open/floor/plasteel,
+/area/engine/gravity_generator)
+"aZ" = (
+/obj/structure/tank_dispenser{
+	pixel_x = -1
+	},
+/turf/open/floor/plating,
+/area/engine/atmos)
+"ba" = (
+/obj/machinery/atmospherics/components/unary/vent_pump/on,
+/turf/open/floor/plating,
+/area/engine/atmos)
+"bb" = (
+/obj/machinery/atmospherics/components/unary/portables_connector/visible{
+	dir = 4
+	},
+/obj/machinery/portable_atmospherics/canister,
+/obj/effect/turf_decal/bot{
+	dir = 2
+	},
+/turf/open/floor/plasteel{
+	dir = 2
+	},
+/area/engine/atmos)
+"bc" = (
+/obj/machinery/atmospherics/components/binary/pump{
+	dir = 8;
+	on = 1
+	},
+/turf/open/floor/plasteel,
+/area/engine/atmos)
+"bd" = (
+/obj/structure/table,
+/obj/item/weldingtool/experimental,
+/turf/open/floor/plating,
+/area/engine/engineering)
+"be" = (
+/obj/structure/cable{
+	icon_state = "1-2"
+	},
+/turf/open/floor/plasteel,
+/area/engine/engineering)
+"bf" = (
+/obj/structure/closet/secure_closet/engineering_chief,
+/turf/open/floor/plating,
+/area/engine/engineering)
+"bg" = (
+/obj/effect/turf_decal/stripes/line{
+	dir = 8
+	},
+/turf/open/floor/plasteel,
+/area/engine/gravity_generator)
+"bh" = (
+/obj/effect/turf_decal/stripes/line{
+	dir = 4
+	},
+/turf/open/floor/plasteel,
+/area/engine/gravity_generator)
+"bi" = (
+/obj/machinery/gravity_generator/main/station,
+/turf/open/floor/plasteel{
+	dir = 8
+	},
+/area/engine/gravity_generator)
+"bj" = (
+/obj/machinery/power/apc{
+	dir = 8;
+	pixel_x = -24
+	},
+/obj/structure/cable{
+	icon_state = "0-2"
+	},
+/obj/machinery/light,
+/obj/structure/table,
+/obj/item/analyzer,
+/obj/item/wrench,
+/turf/open/floor/plating,
+/area/engine/atmos)
+"bk" = (
+/obj/machinery/atmospherics/pipe/manifold/supply/hidden{
+	dir = 8
+	},
+/turf/open/floor/plating,
+/area/engine/atmos)
+"bl" = (
+/obj/machinery/atmospherics/pipe/simple/supply/hidden{
+	dir = 4
+	},
+/obj/machinery/meter,
+/turf/open/floor/plating,
+/area/engine/atmos)
+"bm" = (
+/obj/machinery/atmospherics/components/binary/valve{
+	dir = 4
+	},
+/turf/open/floor/plating,
+/area/engine/atmos)
+"bn" = (
+/obj/machinery/atmospherics/pipe/simple/supply/hidden{
+	dir = 9
+	},
+/obj/machinery/light,
+/turf/open/floor/plating,
+/area/engine/atmos)
+"bo" = (
+/obj/machinery/atmospherics/components/unary/vent_pump/on,
+/obj/structure/table,
+/obj/item/screwdriver/power,
+/obj/item/wirecutters/power,
+/turf/open/floor/plating,
+/area/engine/engineering)
+"bp" = (
+/obj/machinery/light,
+/obj/item/storage/box/lights/mixed,
+/obj/item/lightreplacer,
+/turf/open/floor/plating,
+/area/engine/engineering)
+"bq" = (
+/obj/effect/turf_decal/stripes/line{
+	dir = 10
+	},
+/turf/open/floor/plasteel,
+/area/engine/gravity_generator)
+"br" = (
+/obj/structure/closet/radiation,
+/obj/effect/turf_decal/stripes/line{
+	dir = 6
+	},
+/turf/open/floor/plasteel,
+/area/engine/gravity_generator)
+"bs" = (
+/obj/structure/cable{
+	icon_state = "1-2"
+	},
+/turf/closed/wall/r_wall,
+/area/hallway/primary/central)
+"bt" = (
+/obj/machinery/door/airlock,
+/obj/machinery/atmospherics/pipe/simple/supply/hidden,
+/turf/open/floor/plasteel,
+/area/engine/atmos)
+"bu" = (
+/turf/closed/wall/r_wall,
+/area/bridge)
+"bv" = (
+/obj/effect/spawner/structure/window/reinforced,
+/turf/open/floor/plating,
+/area/bridge)
+"bw" = (
+/obj/machinery/atmospherics/pipe/simple/supply/hidden,
+/turf/closed/wall/r_wall,
+/area/engine/engineering)
+"bx" = (
+/obj/machinery/door/airlock,
+/obj/structure/cable{
+	icon_state = "1-2"
+	},
+/turf/open/floor/plating,
+/area/engine/engineering)
+"by" = (
+/turf/closed/wall/r_wall,
+/area/hallway/secondary/entry)
+"bz" = (
+/obj/machinery/light{
+	dir = 8
+	},
+/turf/open/floor/plating,
+/area/maintenance/department/bridge)
+"bA" = (
+/turf/closed/wall/r_wall,
+/area/hallway/primary/central)
+"bB" = (
+/obj/machinery/power/apc{
+	dir = 8;
+	pixel_x = -24
+	},
+/obj/structure/cable,
+/obj/structure/cable{
+	icon_state = "0-2"
+	},
+/obj/machinery/airalarm{
+	frequency = 1439;
+	locked = 0;
+	pixel_y = 23
+	},
+/obj/structure/closet/jcloset,
+/turf/open/floor/plasteel,
+/area/hallway/primary/central)
+"bC" = (
+/obj/machinery/atmospherics/pipe/manifold/supply/hidden{
+	dir = 8
+	},
+/turf/open/floor/plasteel,
+/area/hallway/primary/central)
+"bD" = (
+/obj/machinery/atmospherics/components/unary/vent_pump/on{
+	dir = 8
+	},
+/turf/open/floor/plasteel,
+/area/hallway/primary/central)
+"bE" = (
+/turf/open/floor/plasteel,
+/area/hallway/primary/central)
+"bF" = (
+/obj/structure/closet/secure_closet/CMO,
+/turf/open/floor/plasteel,
+/area/hallway/primary/central)
+"bG" = (
+/obj/machinery/airalarm{
+	frequency = 1439;
+	locked = 0;
+	pixel_y = 23
+	},
+/obj/machinery/power/apc{
+	dir = 8;
+	pixel_x = -24
+	},
+/obj/structure/cable{
+	icon_state = "0-2"
+	},
+/obj/structure/closet/secure_closet/captains,
+/turf/open/floor/plasteel{
+	dir = 8
+	},
+/area/bridge)
+"bH" = (
+/obj/structure/table,
+/obj/item/ammo_box/c10mm,
+/obj/item/gun/ballistic,
+/turf/open/floor/plasteel,
+/area/bridge)
+"bI" = (
+/obj/structure/table,
+/turf/open/floor/plasteel,
+/area/bridge)
+"bJ" = (
+/obj/structure/table,
+/obj/item/card/id/captains_spare,
+/turf/open/floor/plasteel,
+/area/bridge)
+"bK" = (
+/obj/structure/table,
+/obj/item/storage/backpack/holding,
+/turf/open/floor/plasteel,
+/area/bridge)
+"bL" = (
+/obj/structure/table,
+/obj/item/rcd_ammo/large,
+/obj/item/rcd_ammo/large,
+/obj/item/rcd_ammo/large,
+/obj/item/construction/rcd,
+/turf/open/floor/plasteel,
+/area/bridge)
+"bM" = (
+/obj/structure/closet/secure_closet/hop,
+/turf/open/floor/plasteel{
+	dir = 4
+	},
+/area/bridge)
+"bN" = (
+/obj/machinery/atmospherics/pipe/simple/supply/hidden,
+/turf/open/floor/plasteel,
+/area/hallway/primary/central)
+"bO" = (
+/obj/structure/cable{
+	icon_state = "1-2"
+	},
+/turf/open/floor/plasteel,
+/area/hallway/primary/central)
+"bP" = (
+/obj/machinery/vending/cigarette,
+/turf/open/floor/plasteel,
+/area/hallway/primary/central)
+"bQ" = (
+/obj/machinery/vending/coffee,
+/turf/open/floor/plasteel,
+/area/hallway/primary/central)
+"bR" = (
+/obj/machinery/vending/cola,
+/turf/open/floor/plasteel,
+/area/hallway/primary/central)
+"bS" = (
+/obj/machinery/vending/snack,
+/turf/open/floor/plasteel,
+/area/hallway/primary/central)
+"bT" = (
+/obj/machinery/computer/arcade,
+/turf/open/floor/plasteel,
+/area/hallway/primary/central)
+"bU" = (
+/obj/machinery/airalarm{
+	frequency = 1439;
+	locked = 0;
+	pixel_y = 23
+	},
+/obj/machinery/power/apc{
+	dir = 8;
+	pixel_x = -24
+	},
+/obj/structure/cable{
+	icon_state = "0-2"
+	},
+/obj/structure/closet/firecloset/full,
+/turf/open/floor/plasteel{
+	dir = 9
+	},
+/area/hallway/secondary/entry)
+"bV" = (
+/obj/machinery/light{
+	dir = 1
+	},
+/obj/structure/closet/emcloset,
+/turf/open/floor/plasteel{
+	dir = 1
+	},
+/area/hallway/secondary/entry)
+"bW" = (
+/obj/structure/closet/secure_closet/hos,
+/turf/open/floor/plasteel{
+	dir = 1
+	},
+/area/hallway/secondary/entry)
+"bX" = (
+/obj/structure/closet/emcloset,
+/turf/open/floor/plasteel{
+	dir = 1
+	},
+/area/hallway/secondary/entry)
+"bY" = (
+/obj/effect/spawner/structure/window/reinforced,
+/turf/open/floor/plating,
+/area/maintenance/department/bridge)
+"bZ" = (
+/obj/effect/spawner/structure/window/reinforced,
+/turf/open/floor/plating,
+/area/hallway/primary/central)
+"ca" = (
+/obj/structure/cable{
+	icon_state = "1-4"
+	},
+/obj/structure/cable{
+	icon_state = "2-4"
+	},
+/turf/open/floor/plasteel,
+/area/hallway/primary/central)
+"cb" = (
+/obj/structure/cable{
+	icon_state = "4-8"
+	},
+/obj/machinery/atmospherics/pipe/simple/supply/hidden,
+/turf/open/floor/plasteel,
+/area/hallway/primary/central)
+"cc" = (
+/obj/structure/cable{
+	icon_state = "4-8"
+	},
+/turf/open/floor/plasteel,
+/area/hallway/primary/central)
+"cd" = (
+/obj/effect/spawner/structure/window/reinforced,
+/obj/structure/cable{
+	icon_state = "4-8"
+	},
+/turf/open/floor/plating,
+/area/bridge)
+"ce" = (
+/obj/structure/cable{
+	icon_state = "4-8"
+	},
+/obj/structure/cable{
+	icon_state = "1-4"
+	},
+/turf/open/floor/plasteel{
+	dir = 8
+	},
+/area/bridge)
+"cf" = (
+/obj/structure/cable{
+	icon_state = "4-8"
+	},
+/turf/open/floor/plasteel,
+/area/bridge)
+"cg" = (
+/obj/structure/cable{
+	icon_state = "4-8"
+	},
+/turf/open/floor/plasteel{
+	dir = 4
+	},
+/area/bridge)
+"ch" = (
+/obj/effect/spawner/structure/window/reinforced,
+/obj/structure/cable{
+	icon_state = "4-8"
+	},
+/obj/structure/cable{
+	icon_state = "2-4"
+	},
+/turf/open/floor/plating,
+/area/bridge)
+"ci" = (
+/obj/machinery/atmospherics/pipe/simple/supply/hidden,
+/obj/structure/cable{
+	icon_state = "4-8"
+	},
+/turf/open/floor/plasteel,
+/area/hallway/primary/central)
+"cj" = (
+/obj/structure/cable{
+	icon_state = "4-8"
+	},
+/obj/structure/cable{
+	icon_state = "1-8"
+	},
+/turf/open/floor/plasteel,
+/area/hallway/primary/central)
+"ck" = (
+/obj/structure/cable{
+	icon_state = "4-8"
+	},
+/turf/closed/wall/r_wall,
+/area/hallway/secondary/entry)
+"cl" = (
+/obj/structure/cable{
+	icon_state = "1-8"
+	},
+/turf/open/floor/plasteel{
+	dir = 8
+	},
+/area/hallway/secondary/entry)
+"cn" = (
+/obj/machinery/door/airlock,
+/turf/open/floor/plating,
+/area/hallway/secondary/entry)
+"co" = (
+/obj/machinery/light{
+	dir = 4
+	},
+/turf/open/floor/plasteel,
+/area/hallway/primary/central)
+"cp" = (
+/obj/machinery/light,
+/obj/machinery/atmospherics/components/unary/vent_pump/on,
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+(49,1,3) = {"
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+(50,1,3) = {"
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+(51,1,3) = {"
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+"}
+(52,1,3) = {"
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+"}
diff --git a/_maps/multiz_debug.dm b/_maps/multiz_debug.dm
new file mode 100644
index 0000000000..0521fef59d
--- /dev/null
+++ b/_maps/multiz_debug.dm
@@ -0,0 +1 @@
+#define FORCE_MAP "_maps/multiz_debug.json"
\ No newline at end of file
diff --git a/_maps/multiz_debug.json b/_maps/multiz_debug.json
new file mode 100644
index 0000000000..7e39981e23
--- /dev/null
+++ b/_maps/multiz_debug.json
@@ -0,0 +1,6 @@
+{
+    "map_name": "MultiZ Debug",
+    "map_path": "map_files/debug",
+    "map_file": "multiz.dmm",
+	"traits": [{"Up": 1}, {"Up": 1, "Down": -1}, {"Down": -1}]
+	}
diff --git a/code/__DEFINES/atmospherics.dm b/code/__DEFINES/atmospherics.dm
index 928837979c..f73a74ab19 100644
--- a/code/__DEFINES/atmospherics.dm
+++ b/code/__DEFINES/atmospherics.dm
@@ -143,7 +143,9 @@
 #define ATMOS_PASS_NO 0
 #define ATMOS_PASS_PROC -1 //ask CanAtmosPass()
 #define ATMOS_PASS_DENSITY -2 //just check density
+
 #define CANATMOSPASS(A, O) ( A.CanAtmosPass == ATMOS_PASS_PROC ? A.CanAtmosPass(O) : ( A.CanAtmosPass == ATMOS_PASS_DENSITY ? !A.density : A.CanAtmosPass ) )
+#define CANVERTICALATMOSPASS(A, O) ( A.CanAtmosPassVertical == ATMOS_PASS_PROC ? A.CanAtmosPass(O, TRUE) : ( A.CanAtmosPassVertical == ATMOS_PASS_DENSITY ? !A.density : A.CanAtmosPassVertical ) )
 
 //LAVALAND
 #define LAVALAND_EQUIPMENT_EFFECT_PRESSURE 50 //what pressure you have to be under to increase the effect of equipment meant for lavaland
diff --git a/code/__DEFINES/components.dm b/code/__DEFINES/components.dm
index e33d42df64..e054ec44f3 100644
--- a/code/__DEFINES/components.dm
+++ b/code/__DEFINES/components.dm
@@ -98,6 +98,7 @@
 // /turf signals
 #define COMSIG_TURF_CHANGE "turf_change"						//from base of turf/ChangeTurf(): (path, list/new_baseturfs, flags, list/transferring_comps)
 #define COMSIG_TURF_HAS_GRAVITY "turf_has_gravity"				//from base of atom/has_gravity(): (atom/asker, list/forced_gravities)
+#define COMSIG_TURF_MULTIZ_NEW "turf_multiz_new"				//from base of turf/New(): (turf/source, direction)
 
 // /atom/movable signals
 #define COMSIG_MOVABLE_MOVED "movable_moved"					//from base of atom/movable/Moved(): (/atom, dir)
diff --git a/code/__DEFINES/is_helpers.dm b/code/__DEFINES/is_helpers.dm
index 9f69da0154..5683ee52ea 100644
--- a/code/__DEFINES/is_helpers.dm
+++ b/code/__DEFINES/is_helpers.dm
@@ -13,6 +13,16 @@
 //Turfs
 //#define isturf(A) (istype(A, /turf)) This is actually a byond built-in. Added here for completeness sake.
 
+GLOBAL_LIST_INIT(turfs_without_ground, typecacheof(list(
+	/turf/open/space,
+	/turf/open/chasm,
+	/turf/open/lava,
+	/turf/open/water,
+	/turf/open/openspace
+	)))
+
+#define isgroundlessturf(A) (is_type_in_typecache(A, GLOB.turfs_without_ground))
+
 #define isopenturf(A) (istype(A, /turf/open))
 
 #define isindestructiblefloor(A) (istype(A, /turf/open/indestructible))
diff --git a/code/__DEFINES/layers.dm b/code/__DEFINES/layers.dm
index 5e903997e4..e0a22667ac 100644
--- a/code/__DEFINES/layers.dm
+++ b/code/__DEFINES/layers.dm
@@ -9,6 +9,7 @@
 #define FLOOR_PLANE -2
 #define GAME_PLANE -1
 #define BLACKNESS_PLANE 0 //To keep from conflicts with SEE_BLACKNESS internals
+
 #define SPACE_LAYER 1.8
 //#define TURF_LAYER 2 //For easy recordkeeping; this is a byond define
 #define MID_TURF_LAYER 2.02
@@ -83,25 +84,28 @@
 #define ABOVE_LIGHTING_PLANE 16
 #define ABOVE_LIGHTING_LAYER 16
 
-#define BYOND_LIGHTING_PLANE 17
-#define BYOND_LIGHTING_LAYER 17
+#define FLOOR_OPENSPACE_PLANE 17
+#define OPENSPACE_LAYER 17
 
-#define CAMERA_STATIC_PLANE 18
-#define CAMERA_STATIC_LAYER 18
+#define BYOND_LIGHTING_PLANE 18
+#define BYOND_LIGHTING_LAYER 18
+
+#define CAMERA_STATIC_PLANE 19
+#define CAMERA_STATIC_LAYER 19
 //HUD layer defines
 
-#define FULLSCREEN_PLANE 19
-#define FLASH_LAYER 19
-#define FULLSCREEN_LAYER 19.1
-#define UI_DAMAGE_LAYER 19.2
-#define BLIND_LAYER 19.3
-#define CRIT_LAYER 19.4
-#define CURSE_LAYER 19.5
+#define FULLSCREEN_PLANE 20
+#define FLASH_LAYER 20
+#define FULLSCREEN_LAYER 20.1
+#define UI_DAMAGE_LAYER 20.2
+#define BLIND_LAYER 20.3
+#define CRIT_LAYER 20.4
+#define CURSE_LAYER 20.5
 
-#define HUD_PLANE 20
-#define HUD_LAYER 20
-#define ABOVE_HUD_PLANE 21
-#define ABOVE_HUD_LAYER 21
+#define HUD_PLANE 21
+#define HUD_LAYER 21
+#define ABOVE_HUD_PLANE 22
+#define ABOVE_HUD_LAYER 22
 
-#define SPLASHSCREEN_LAYER 22
-#define SPLASHSCREEN_PLANE 22
+#define SPLASHSCREEN_LAYER 23
+#define SPLASHSCREEN_PLANE 23
diff --git a/code/__DEFINES/maps.dm b/code/__DEFINES/maps.dm
index 179f501fd1..096b3c19f7 100644
--- a/code/__DEFINES/maps.dm
+++ b/code/__DEFINES/maps.dm
@@ -37,6 +37,7 @@ require only minor tweaks.
 #define ZTRAIT_AWAY "Away Mission"
 #define ZTRAIT_SPACE_RUINS "Space Ruins"
 #define ZTRAIT_LAVA_RUINS "Lava Ruins"
+#define ZTRAIT_ISOLATED_RUINS "Isolated Ruins" //Placing ruins on z levels with this trait will use turf reservation instead of usual placement.
 // prevents certain turfs from being stripped by a singularity
 #define ZTRAIT_PLANET "Planet"
 
@@ -89,6 +90,8 @@ require only minor tweaks.
 #define PLACEMENT_TRIES 100 //How many times we try to fit the ruin somewhere until giving up (really should just swap to some packing algo)
 
 #define PLACE_DEFAULT "random"
-#define PLACE_SAME_Z "same"
-#define PLACE_SPACE_RUIN "space"
-#define PLACE_LAVA_RUIN "lavaland"
+#define PLACE_SAME_Z "same" //On same z level as original ruin
+#define PLACE_SPACE_RUIN "space" //On space ruin z level(s)
+#define PLACE_LAVA_RUIN "lavaland" //On lavaland ruin z levels(s)
+#define PLACE_BELOW "below" //On z levl below - centered on same tile
+#define PLACE_ISOLATED "isolated" //On isolated ruin z level
diff --git a/code/__DEFINES/obj_flags.dm b/code/__DEFINES/obj_flags.dm
index 1917d73a1b..8d00836345 100644
--- a/code/__DEFINES/obj_flags.dm
+++ b/code/__DEFINES/obj_flags.dm
@@ -11,6 +11,7 @@
 #define USES_TGUI				(1<<7)	//put on things that use tgui on ui_interact instead of custom/old UI.
 #define FROZEN					(1<<8)
 #define SHOVABLE_ONTO			(1<<9) //called on turf.shove_act() to consider whether an object should have a niche effect (defined in their own shove_act()) when someone is pushed onto it, or do a sanity CanPass() check.
+#define BLOCK_Z_FALL			(1<<10)
 
 // If you add new ones, be sure to add them to /obj/Initialize as well for complete mapping support
 
diff --git a/code/_globalvars/lists/mapping.dm b/code/_globalvars/lists/mapping.dm
index 0cb61949a0..f0479cd8aa 100644
--- a/code/_globalvars/lists/mapping.dm
+++ b/code/_globalvars/lists/mapping.dm
@@ -1,6 +1,16 @@
 GLOBAL_LIST_INIT(cardinals, list(NORTH, SOUTH, EAST, WEST))
-GLOBAL_LIST_INIT(alldirs, list(NORTH, SOUTH, EAST, WEST, NORTHEAST, NORTHWEST, SOUTHEAST, SOUTHWEST))
+GLOBAL_LIST_INIT(cardinals_multiz, list(NORTH, SOUTH, EAST, WEST, UP, DOWN))
 GLOBAL_LIST_INIT(diagonals, list(NORTHEAST, NORTHWEST, SOUTHEAST, SOUTHWEST))
+GLOBAL_LIST_INIT(corners_multiz, list(UP|NORTHEAST, UP|NORTHWEST, UP|SOUTHEAST, UP|SOUTHWEST, DOWN|NORTHEAST, DOWN|NORTHWEST, DOWN|SOUTHEAST, DOWN|SOUTHWEST))
+GLOBAL_LIST_INIT(diagonals_multiz, list(
+	NORTHEAST, NORTHWEST, SOUTHEAST, SOUTHWEST,
+	UP|NORTH, UP|SOUTH, UP|EAST, UP|WEST, UP|NORTHEAST, UP|NORTHWEST, UP|SOUTHEAST, UP|SOUTHWEST,
+	DOWN|NORTH, DOWN|SOUTH, DOWN|EAST, DOWN|WEST, DOWN|NORTHEAST, DOWN|NORTHWEST, DOWN|SOUTHEAST, DOWN|SOUTHWEST))
+GLOBAL_LIST_INIT(alldirs_multiz, list(
+	NORTH, SOUTH, EAST, WEST, NORTHEAST, NORTHWEST, SOUTHEAST, SOUTHWEST,
+	UP, UP|NORTH, UP|SOUTH, UP|EAST, UP|WEST, UP|NORTHEAST, UP|NORTHWEST, UP|SOUTHEAST, UP|SOUTHWEST,
+	DOWN, DOWN|NORTH, DOWN|SOUTH, DOWN|EAST, DOWN|WEST, DOWN|NORTHEAST, DOWN|NORTHWEST, DOWN|SOUTHEAST, DOWN|SOUTHWEST))
+GLOBAL_LIST_INIT(alldirs, list(NORTH, SOUTH, EAST, WEST, NORTHEAST, NORTHWEST, SOUTHEAST, SOUTHWEST))
 
 GLOBAL_LIST_EMPTY(landmarks_list)				//list of all landmarks created
 GLOBAL_LIST_EMPTY(start_landmarks_list)			//list of all spawn points created
diff --git a/code/_onclick/hud/plane_master.dm b/code/_onclick/hud/plane_master.dm
index 8ee837a202..9dc23a5861 100644
--- a/code/_onclick/hud/plane_master.dm
+++ b/code/_onclick/hud/plane_master.dm
@@ -16,6 +16,28 @@
 //Trust me, you need one. Period. If you don't think you do, you're doing something extremely wrong.
 /obj/screen/plane_master/proc/backdrop(mob/mymob)
 
+/obj/screen/plane_master/openspace
+	name = "open space plane master"
+	plane = FLOOR_OPENSPACE_PLANE
+	appearance_flags = PLANE_MASTER
+	blend_mode = BLEND_MULTIPLY
+	alpha = 255
+
+/obj/screen/plane_master/openspace/backdrop(mob/mymob)
+	filters = list()
+	filters += filter(type = "drop_shadow", color = "#04080FAA", border = 5, size = -10)
+	filters += filter(type = "drop_shadow", color = "#04080FAA", border = 5, size = -15)
+	filters += filter(type = "drop_shadow", color = "#04080FAA", border = 5, size = -20)
+
+/obj/screen/plane_master/proc/outline(_size, _color)
+	filters += filter(type = "outline", size = _size, color = _color)
+
+/obj/screen/plane_master/proc/shadow(_size, _border, _offset = 0, _x = 0, _y = 0, _color = "#04080FAA")
+	filters += filter(type = "drop_shadow", x = _x, y = _y, color = _color, size = _size, offset = _offset, border = _border)
+
+/obj/screen/plane_master/proc/clear_filters()
+	filters = list()
+
 /obj/screen/plane_master/floor
 	name = "floor plane master"
 	plane = FLOOR_PLANE
diff --git a/code/controllers/subsystem/mapping.dm b/code/controllers/subsystem/mapping.dm
index 345e3bb44c..dc30d54d24 100644
--- a/code/controllers/subsystem/mapping.dm
+++ b/code/controllers/subsystem/mapping.dm
@@ -14,6 +14,7 @@ SUBSYSTEM_DEF(mapping)
 	var/list/ruins_templates = list()
 	var/list/space_ruins_templates = list()
 	var/list/lava_ruins_templates = list()
+	var/datum/space_level/isolated_ruins_z //Created on demand during ruin loading.
 
 	var/list/shuttle_templates = list()
 	var/list/shelter_templates = list()
@@ -25,6 +26,7 @@ SUBSYSTEM_DEF(mapping)
 	var/list/datum/turf_reservations		//list of turf reservations
 	var/list/used_turfs = list()				//list of turf = datum/turf_reservation
 
+	var/list/reservation_ready = list()
 	var/clearing_reserved_turfs = FALSE
 
 	// Z-manager stuff
@@ -93,7 +95,7 @@ SUBSYSTEM_DEF(mapping)
 	// Set up Z-level transitions.
 	setup_map_transitions()
 	generate_station_area_list()
-	initialize_reserved_level()
+	initialize_reserved_level(transit.z_value)
 	return ..()
 
 /* Nuke threats, for making the blue tiles on the station go RED
@@ -440,7 +442,7 @@ GLOBAL_LIST_EMPTY(the_station_areas)
 		GLOB.the_gateway.wait = world.time
 
 /datum/controller/subsystem/mapping/proc/RequestBlockReservation(width, height, z, type = /datum/turf_reservation, turf_type_override, border_type_override)
-	UNTIL(initialized && !clearing_reserved_turfs)
+	UNTIL(reservation_ready["[z]"] && !clearing_reserved_turfs)
 	var/datum/turf_reservation/reserve = new type
 	if(turf_type_override)
 		reserve.turf_type = turf_type_override
@@ -452,8 +454,9 @@ GLOBAL_LIST_EMPTY(the_station_areas)
 				return reserve
 		//If we didn't return at this point, theres a good chance we ran out of room on the exisiting reserved z levels, so lets try a new one
 		num_of_res_levels += 1
-		var/newReserved = add_new_zlevel("Transit/Reserved [num_of_res_levels]", list(ZTRAIT_RESERVED = TRUE))
-		if(reserve.Reserve(width, height, newReserved))
+		var/datum/space_level/newReserved = add_new_zlevel("Transit/Reserved [num_of_res_levels]", list(ZTRAIT_RESERVED = TRUE))
+		initialize_reserved_level(newReserved.z_value)
+		if(reserve.Reserve(width, height, newReserved.z_value))
 			return reserve
 	else
 		if(!level_trait(z, ZTRAIT_RESERVED))
@@ -465,19 +468,22 @@ GLOBAL_LIST_EMPTY(the_station_areas)
 	QDEL_NULL(reserve)
 
 //This is not for wiping reserved levels, use wipe_reservations() for that.
-/datum/controller/subsystem/mapping/proc/initialize_reserved_level()
+/datum/controller/subsystem/mapping/proc/initialize_reserved_level(z)
 	UNTIL(!clearing_reserved_turfs)				//regardless, lets add a check just in case.
 	clearing_reserved_turfs = TRUE			//This operation will likely clear any existing reservations, so lets make sure nothing tries to make one while we're doing it.
-	for(var/i in levels_by_trait(ZTRAIT_RESERVED))
-		var/turf/A = get_turf(locate(SHUTTLE_TRANSIT_BORDER,SHUTTLE_TRANSIT_BORDER,i))
-		var/turf/B = get_turf(locate(world.maxx - SHUTTLE_TRANSIT_BORDER,world.maxy - SHUTTLE_TRANSIT_BORDER,i))
-		var/block = block(A, B)
-		for(var/t in block)
-			// No need to empty() these, because it's world init and they're
-			// already /turf/open/space/basic.
-			var/turf/T = t
-			T.flags_1 |= UNUSED_RESERVATION_TURF_1
-		unused_turfs["[i]"] = block
+	if(!level_trait(z,ZTRAIT_RESERVED))
+		clearing_reserved_turfs = FALSE
+		CRASH("Invalid z level prepared for reservations.")
+	var/turf/A = get_turf(locate(SHUTTLE_TRANSIT_BORDER,SHUTTLE_TRANSIT_BORDER,z))
+	var/turf/B = get_turf(locate(world.maxx - SHUTTLE_TRANSIT_BORDER,world.maxy - SHUTTLE_TRANSIT_BORDER,z))
+	var/block = block(A, B)
+	for(var/t in block)
+		// No need to empty() these, because it's world init and they're
+		// already /turf/open/space/basic.
+		var/turf/T = t
+		T.flags_1 |= UNUSED_RESERVATION_TURF_1
+	unused_turfs["[z]"] = block
+	reservation_ready["[z]"] = TRUE
 	clearing_reserved_turfs = FALSE
 
 /datum/controller/subsystem/mapping/proc/reserve_turfs(list/turfs)
@@ -511,3 +517,9 @@ GLOBAL_LIST_EMPTY(the_station_areas)
 	for(var/B in areas)
 		var/area/A = B
 		A.reg_in_areas_in_z()
+
+/datum/controller/subsystem/mapping/proc/get_isolated_ruin_z()
+	if(!isolated_ruins_z)
+		isolated_ruins_z = add_new_zlevel("Isolated Ruins/Reserved", list(ZTRAIT_RESERVED = TRUE, ZTRAIT_ISOLATED_RUINS = TRUE))
+		initialize_reserved_level(isolated_ruins_z.z_value)
+	return isolated_ruins_z.z_value
\ No newline at end of file
diff --git a/code/controllers/subsystem/throwing.dm b/code/controllers/subsystem/throwing.dm
index 77ad712b99..a660ac5437 100644
--- a/code/controllers/subsystem/throwing.dm
+++ b/code/controllers/subsystem/throwing.dm
@@ -146,6 +146,11 @@ SUBSYSTEM_DEF(throwing)
 	if (callback)
 		callback.Invoke()
 
+	if(!thrownthing.zfalling) // I don't think you can zfall while thrown but hey, just in case.
+		var/turf/T = get_turf(thrownthing)
+		if(T && thrownthing.has_gravity(T))
+			T.zFall(thrownthing)
+
 	qdel(src)
 
 /datum/thrownthing/proc/hit_atom(atom/A)
diff --git a/code/game/atoms.dm b/code/game/atoms.dm
index 2a47d6d015..fc8edc17cc 100644
--- a/code/game/atoms.dm
+++ b/code/game/atoms.dm
@@ -186,6 +186,10 @@
 			else
 				M.forceMove(src)
 
+//common name
+/atom/proc/update_multiz(prune_on_fail = FALSE)
+	return FALSE
+
 /atom/proc/assume_air(datum/gas_mixture/giver)
 	qdel(giver)
 	return null
@@ -266,7 +270,7 @@
 	if(SEND_SIGNAL(src, COMSIG_ATOM_GET_EXAMINE_NAME, user, override) & COMPONENT_EXNAME_CHANGED)
 		should_override = TRUE
 
-	
+
 	if(blood_DNA && !istype(src, /obj/effect/decal))
 		override[EXAMINE_POSITION_BEFORE] = " blood-stained "
 		should_override = TRUE
@@ -832,4 +836,7 @@ Proc for attack log creation, because really why not
 	if(filter_data[name])
 		filter_data -= name
 		update_filters()
-		return TRUE
\ No newline at end of file
+		return TRUE
+
+/atom/proc/intercept_zImpact(atom/movable/AM, levels = 1)
+	return FALSE
\ No newline at end of file
diff --git a/code/game/atoms_movable.dm b/code/game/atoms_movable.dm
index 83762240bc..bdc50571f8 100644
--- a/code/game/atoms_movable.dm
+++ b/code/game/atoms_movable.dm
@@ -35,6 +35,51 @@
 	var/datum/component/orbiter/orbiting
 	var/can_be_z_moved = TRUE
 
+	var/zfalling = FALSE
+
+/atom/movable/proc/can_zFall(turf/source, levels = 1, turf/target, direction)
+	if(!direction)
+		direction = DOWN
+	if(!source)
+		source = get_turf(src)
+		if(!source)
+			return FALSE
+	if(!target)
+		target = get_step_multiz(source, direction)
+		if(!target)
+			return FALSE
+	return !(movement_type & FLYING) && has_gravity(source) && !throwing
+
+/atom/movable/proc/onZImpact(turf/T, levels)
+	var/atom/highest = T
+	for(var/i in T.contents)
+		var/atom/A = i
+		if(!A.density)
+			continue
+		if(isobj(A) || ismob(A))
+			if(A.layer > highest.layer)
+				highest = A
+	INVOKE_ASYNC(src, .proc/SpinAnimation, 5, 2)
+	throw_impact(highest)
+	return TRUE
+
+//For physical constraints to travelling up/down.
+/atom/movable/proc/can_zTravel(turf/destination, direction)
+	var/turf/T = get_turf(src)
+	if(!T)
+		return FALSE
+	if(!direction)
+		if(!destination)
+			return FALSE
+		direction = get_dir(T, destination)
+	if(direction != UP && direction != DOWN)
+		return FALSE
+	if(!destination)
+		destination = get_step_multiz(src, direction)
+		if(!destination)
+			return FALSE
+	return T.zPassOut(src, direction, destination) && destination.zPassIn(src, direction, T)
+
 /atom/movable/vv_edit_var(var_name, var_value)
 	var/static/list/banned_edits = list("step_x", "step_y", "step_size")
 	var/static/list/careful_edits = list("bound_x", "bound_y", "bound_width", "bound_height")
diff --git a/code/game/objects/effects/decals/decal.dm b/code/game/objects/effects/decals/decal.dm
index b6a3c7cfef..2fa7277d8b 100644
--- a/code/game/objects/effects/decals/decal.dm
+++ b/code/game/objects/effects/decals/decal.dm
@@ -15,7 +15,7 @@
 		qdel(src)
 
 /obj/effect/decal/proc/NeverShouldHaveComeHere(turf/T)
-	return isspaceturf(T) || isclosedturf(T) || islava(T) || istype(T, /turf/open/water) || ischasm(T)
+	return isclosedturf(T) || isgroundlessturf(T)
 
 /obj/effect/decal/ex_act(severity, target)
 	qdel(src)
diff --git a/code/game/objects/effects/effects.dm b/code/game/objects/effects/effects.dm
index 410923fe25..d48013d472 100644
--- a/code/game/objects/effects/effects.dm
+++ b/code/game/objects/effects/effects.dm
@@ -57,6 +57,9 @@
 /obj/effect/abstract/singularity_act()
 	return
 
+/obj/effect/abstract/has_gravity(turf/T)
+	return FALSE
+
 /obj/effect/dummy/singularity_pull()
 	return
 
diff --git a/code/game/objects/structures/lattice.dm b/code/game/objects/structures/lattice.dm
index d6f304653d..a6ba6424b1 100644
--- a/code/game/objects/structures/lattice.dm
+++ b/code/game/objects/structures/lattice.dm
@@ -100,6 +100,7 @@
 	number_of_rods = 2
 	smooth = SMOOTH_TRUE
 	canSmoothWith = null
+	obj_flags = CAN_BE_HIT | BLOCK_Z_FALL
 
 /obj/structure/lattice/catwalk/deconstruction_hints(mob/user)
 	to_chat(user, "<span class='notice'>The supporting rods look like they could be <b>cut</b>.</span>")
diff --git a/code/game/objects/structures/stairs.dm b/code/game/objects/structures/stairs.dm
new file mode 100644
index 0000000000..89ea95ce4d
--- /dev/null
+++ b/code/game/objects/structures/stairs.dm
@@ -0,0 +1,125 @@
+#define STAIR_TERMINATOR_AUTOMATIC 0
+#define STAIR_TERMINATOR_NO 1
+#define STAIR_TERMINATOR_YES 2
+
+/obj/structure/stairs
+	name = "stairs"
+	icon = 'icons/obj/stairs.dmi'
+	icon_state = "stairs"
+	anchored = TRUE
+	//dir = direction of travel to go upwards
+
+	var/force_open_above = FALSE
+	var/terminator_mode = STAIR_TERMINATOR_AUTOMATIC
+	var/turf/listeningTo
+
+/obj/structure/stairs/Initialize(mapload)
+	if(force_open_above)
+		force_open_above()
+		build_signal_listener()
+	update_surrounding()
+	return ..()
+
+/obj/structure/stairs/Destroy()
+	listeningTo = null
+	return ..()
+
+/obj/structure/stairs/Move()			//Look this should never happen but...
+	. = ..()
+	if(force_open_above)
+		build_signal_listener()
+	update_surrounding()
+
+/obj/structure/stairs/proc/update_surrounding()
+	update_icon()
+	for(var/i in GLOB.cardinals)
+		var/turf/T = get_step(get_turf(src), i)
+		var/obj/structure/stairs/S = locate() in T
+		if(S)
+			S.update_icon()
+
+/obj/structure/stairs/Uncross(atom/movable/AM, turf/newloc)
+	if(!newloc || !AM)
+		return ..()
+	if(!isobserver(AM) && isTerminator() && (get_dir(src, newloc) == dir))
+		stair_ascend(AM)
+		return FALSE
+	return ..()
+
+/obj/structure/stairs/Cross(atom/movable/AM)
+	if(isTerminator() && (get_dir(src, AM) == dir))
+		return FALSE
+	return ..()
+
+/obj/structure/stairs/update_icon()
+	if(isTerminator())
+		icon_state = "stairs_t"
+	else
+		icon_state = "stairs"
+
+/obj/structure/stairs/proc/stair_ascend(atom/movable/AM)
+	var/turf/checking = get_step_multiz(get_turf(src), UP)
+	if(!istype(checking))
+		return
+	if(!checking.zPassIn(AM, UP, get_turf(src)))
+		return
+	var/turf/target = get_step_multiz(get_turf(src), (dir|UP))
+	if(istype(target) && !target.can_zFall(AM, null, get_step_multiz(target, DOWN)))			//Don't throw them into a tile that will just dump them back down.
+		if(isliving(AM))
+			var/mob/living/L = AM
+			var/pulling = L.pulling
+			if(pulling)
+				L.pulling.forceMove(target)
+			L.forceMove(target)
+			L.start_pulling(pulling)
+		else
+			AM.forceMove(target)
+
+/obj/structure/stairs/vv_edit_var(var_name, var_value)
+	. = ..()
+	if(!.)
+		return
+	if(var_name != NAMEOF(src, force_open_above))
+		return
+	if(!var_value)
+		if(listeningTo)
+			UnregisterSignal(listeningTo, COMSIG_TURF_MULTIZ_NEW)
+			listeningTo = null
+	else
+		build_signal_listener()
+		force_open_above()
+
+/obj/structure/stairs/proc/build_signal_listener()
+	if(listeningTo)
+		UnregisterSignal(listeningTo, COMSIG_TURF_MULTIZ_NEW)
+	var/turf/open/openspace/T = get_step_multiz(get_turf(src), UP)
+	RegisterSignal(T, COMSIG_TURF_MULTIZ_NEW, .proc/on_multiz_new)
+	listeningTo = T
+
+/obj/structure/stairs/proc/force_open_above()
+	var/turf/open/openspace/T = get_step_multiz(get_turf(src), UP)
+	if(T && !istype(T))
+		T.ChangeTurf(/turf/open/openspace)
+
+/obj/structure/stairs/proc/on_multiz_new(turf/source, dir)
+	if(dir == UP)
+		var/turf/open/openspace/T = get_step_multiz(get_turf(src), UP)
+		if(T && !istype(T))
+			T.ChangeTurf(/turf/open/openspace)
+
+/obj/structure/stairs/intercept_zImpact(atom/movable/AM, levels = 1)
+	return isTerminator()
+
+/obj/structure/stairs/proc/isTerminator()			//If this is the last stair in a chain and should move mobs up
+	if(terminator_mode != STAIR_TERMINATOR_AUTOMATIC)
+		return (terminator_mode == STAIR_TERMINATOR_YES)
+	var/turf/T = get_turf(src)
+	if(!T)
+		return FALSE
+	var/turf/them = get_step(T, dir)
+	if(!them)
+		return FALSE
+	for(var/obj/structure/stairs/S in them)
+		if(S.dir == dir)
+			return FALSE
+	return TRUE
diff --git a/code/game/turfs/open.dm b/code/game/turfs/open.dm
index bd24e0ff93..833a07c9c3 100644
--- a/code/game/turfs/open.dm
+++ b/code/game/turfs/open.dm
@@ -16,6 +16,22 @@
 	if(wet)
 		AddComponent(/datum/component/wet_floor, wet, INFINITY, 0, INFINITY, TRUE)
 
+//direction is direction of travel of A
+/turf/open/zPassIn(atom/movable/A, direction, turf/source)
+	return (direction == DOWN)
+
+//direction is direction of travel of A
+/turf/open/zPassOut(atom/movable/A, direction, turf/destination)
+	return (direction == UP)
+
+//direction is direction of travel of air
+/turf/open/zAirIn(direction, turf/source)
+	return (direction == DOWN)
+
+//direction is direction of travel of air
+/turf/open/zAirOut(direction, turf/source)
+	return (direction == UP)
+
 /turf/open/MouseDrop_T(atom/dropping, mob/user)
 	. = ..()
 	if(dropping == user && isliving(user))
@@ -184,43 +200,14 @@
 	update_visuals()
 
 	current_cycle = times_fired
-
-	//cache some vars
-	var/list/atmos_adjacent_turfs = src.atmos_adjacent_turfs
-
-	for(var/direction in GLOB.cardinals)
-		var/turf/open/enemy_tile = get_step(src, direction)
-		if(!istype(enemy_tile))
-			if (atmos_adjacent_turfs)
-				atmos_adjacent_turfs -= enemy_tile
-			continue
+	CalculateAdjacentTurfs()
+	for(var/i in atmos_adjacent_turfs)
+		var/turf/open/enemy_tile = i
 		var/datum/gas_mixture/enemy_air = enemy_tile.return_air()
-
-		//only check this turf, if it didn't check us when it was initalized
-		if(enemy_tile.current_cycle < times_fired)
-			if(CANATMOSPASS(src, enemy_tile))
-				LAZYINITLIST(atmos_adjacent_turfs)
-				LAZYINITLIST(enemy_tile.atmos_adjacent_turfs)
-				atmos_adjacent_turfs[enemy_tile] = TRUE
-				enemy_tile.atmos_adjacent_turfs[src] = TRUE
-			else
-				if (atmos_adjacent_turfs)
-					atmos_adjacent_turfs -= enemy_tile
-				if (enemy_tile.atmos_adjacent_turfs)
-					enemy_tile.atmos_adjacent_turfs -= src
-				UNSETEMPTY(enemy_tile.atmos_adjacent_turfs)
-				continue
-		else
-			if (!atmos_adjacent_turfs || !atmos_adjacent_turfs[enemy_tile])
-				continue
-
 		if(!excited && air.compare(enemy_air))
 			//testing("Active turf found. Return value of compare(): [is_active]")
 			excited = TRUE
 			SSair.active_turfs |= src
-	UNSETEMPTY(atmos_adjacent_turfs)
-	if (atmos_adjacent_turfs)
-		src.atmos_adjacent_turfs = atmos_adjacent_turfs
 
 /turf/open/proc/GetHeatCapacity()
 	. = air.heat_capacity()
diff --git a/code/game/turfs/openspace/openspace.dm b/code/game/turfs/openspace/openspace.dm
new file mode 100644
index 0000000000..7fc9173f65
--- /dev/null
+++ b/code/game/turfs/openspace/openspace.dm
@@ -0,0 +1,134 @@
+/turf/open/openspace
+	name = "open space"
+	desc = "Watch your step!"
+	icon_state = "grey"
+	baseturfs = /turf/open/openspace
+	CanAtmosPassVertical = ATMOS_PASS_YES
+	plane = FLOOR_OPENSPACE_PLANE
+	layer = OPENSPACE_LAYER
+	//mouse_opacity = MOUSE_OPACITY_TRANSPARENT
+	var/can_cover_up = TRUE
+	var/can_build_on = TRUE
+
+/turf/open/openspace/debug/update_multiz()
+	..()
+	return TRUE
+
+/turf/open/openspace/Initialize()
+	. = ..()
+	return INITIALIZE_HINT_LATELOAD
+
+/turf/open/openspace/LateInitialize()
+	update_multiz(TRUE, TRUE)
+
+/turf/open/openspace/Destroy()
+	vis_contents.len = 0
+	return ..()
+
+/turf/open/openspace/update_multiz(prune_on_fail = FALSE, init = FALSE)
+	. = ..()
+	var/turf/T = below()
+	if(!T)
+		vis_contents.len = 0
+		if(prune_on_fail)
+			ChangeTurf(/turf/open/floor/plating)
+		return FALSE
+	if(init)
+		vis_contents += T
+	return TRUE
+
+/turf/open/openspace/multiz_turf_del(turf/T, dir)
+	if(dir != DOWN)
+		return
+	update_multiz()
+
+/turf/open/openspace/multiz_turf_new(turf/T, dir)
+	if(dir != DOWN)
+		return
+	update_multiz()
+
+/turf/open/openspace/zAirIn()
+	return TRUE
+
+/turf/open/openspace/zAirOut()
+	return TRUE
+
+/turf/open/openspace/zPassIn(atom/movable/A, direction, turf/source)
+	return TRUE
+
+/turf/open/openspace/zPassOut(atom/movable/A, direction, turf/destination)
+	if(A.anchored)
+		return FALSE
+	for(var/obj/O in contents)
+		if(O.obj_flags & BLOCK_Z_FALL)
+			return FALSE
+	return TRUE
+
+/turf/open/openspace/proc/CanCoverUp()
+	return can_cover_up
+
+/turf/open/openspace/proc/CanBuildHere()
+	return can_build_on
+
+/turf/open/openspace/attackby(obj/item/C, mob/user, params)
+	..()
+	if(!CanBuildHere())
+		return
+	if(istype(C, /obj/item/stack/rods))
+		var/obj/item/stack/rods/R = C
+		var/obj/structure/lattice/L = locate(/obj/structure/lattice, src)
+		var/obj/structure/lattice/catwalk/W = locate(/obj/structure/lattice/catwalk, src)
+		if(W)
+			to_chat(user, "<span class='warning'>There is already a catwalk here!</span>")
+			return
+		if(L)
+			if(R.use(1))
+				to_chat(user, "<span class='notice'>You construct a catwalk.</span>")
+				playsound(src, 'sound/weapons/genhit.ogg', 50, 1)
+				new/obj/structure/lattice/catwalk(src)
+			else
+				to_chat(user, "<span class='warning'>You need two rods to build a catwalk!</span>")
+			return
+		if(R.use(1))
+			to_chat(user, "<span class='notice'>You construct a lattice.</span>")
+			playsound(src, 'sound/weapons/genhit.ogg', 50, 1)
+			ReplaceWithLattice()
+		else
+			to_chat(user, "<span class='warning'>You need one rod to build a lattice.</span>")
+		return
+	if(istype(C, /obj/item/stack/tile/plasteel))
+		if(!CanCoverUp())
+			return
+		var/obj/structure/lattice/L = locate(/obj/structure/lattice, src)
+		if(L)
+			var/obj/item/stack/tile/plasteel/S = C
+			if(S.use(1))
+				qdel(L)
+				playsound(src, 'sound/weapons/genhit.ogg', 50, 1)
+				to_chat(user, "<span class='notice'>You build a floor.</span>")
+				PlaceOnTop(/turf/open/floor/plating)
+			else
+				to_chat(user, "<span class='warning'>You need one floor tile to build a floor!</span>")
+		else
+			to_chat(user, "<span class='warning'>The plating is going to need some support! Place metal rods first.</span>")
+
+/turf/open/openspace/rcd_vals(mob/user, obj/item/construction/rcd/the_rcd)
+	if(!CanBuildHere())
+		return FALSE
+
+	switch(the_rcd.mode)
+		if(RCD_FLOORWALL)
+			var/obj/structure/lattice/L = locate(/obj/structure/lattice, src)
+			if(L)
+				return list("mode" = RCD_FLOORWALL, "delay" = 0, "cost" = 1)
+			else
+				return list("mode" = RCD_FLOORWALL, "delay" = 0, "cost" = 3)
+	return FALSE
+
+/turf/open/openspace/rcd_act(mob/user, obj/item/construction/rcd/the_rcd, passed_mode)
+	switch(passed_mode)
+		if(RCD_FLOORWALL)
+			to_chat(user, "<span class='notice'>You build a floor.</span>")
+			PlaceOnTop(/turf/open/floor/plating, flags = CHANGETURF_INHERIT_AIR)
+			return TRUE
+	return FALSE
diff --git a/code/game/turfs/turf.dm b/code/game/turfs/turf.dm
index ebf6f6626c..7fe48365ef 100755
--- a/code/game/turfs/turf.dm
+++ b/code/game/turfs/turf.dm
@@ -39,7 +39,7 @@
 		return FALSE
 	. = ..()
 
-/turf/Initialize()
+/turf/Initialize(mapload)
 	if(flags_1 & INITIALIZED_1)
 		stack_trace("Warning: [src]([type]) initialized multiple times!")
 	flags_1 |= INITIALIZED_1
@@ -68,6 +68,15 @@
 	if (light_power && light_range)
 		update_light()
 
+	var/turf/T = SSmapping.get_turf_above(src)
+	if(T)
+		T.multiz_turf_new(src, DOWN)
+		SEND_SIGNAL(T, COMSIG_TURF_MULTIZ_NEW, src, DOWN)
+	T = SSmapping.get_turf_below(src)
+	if(T)
+		T.multiz_turf_new(src, UP)
+		SEND_SIGNAL(T, COMSIG_TURF_MULTIZ_NEW, src, UP)
+
 	if (opacity)
 		has_opaque_atom = TRUE
 
@@ -83,6 +92,12 @@
 	if(!changing_turf)
 		stack_trace("Incorrect turf deletion")
 	changing_turf = FALSE
+	var/turf/T = SSmapping.get_turf_above(src)
+	if(T)
+		T.multiz_turf_del(src, DOWN)
+	T = SSmapping.get_turf_below(src)
+	if(T)
+		T.multiz_turf_del(src, UP)
 	if(force)
 		..()
 		//this will completely wipe turf state
@@ -105,6 +120,54 @@
 		return
 	user.Move_Pulled(src)
 
+/turf/proc/multiz_turf_del(turf/T, dir)
+
+/turf/proc/multiz_turf_new(turf/T, dir)
+
+//zPassIn doesn't necessarily pass an atom!
+//direction is direction of travel of air
+/turf/proc/zPassIn(atom/movable/A, direction, turf/source)
+	return FALSE
+
+//direction is direction of travel of air
+/turf/proc/zPassOut(atom/movable/A, direction, turf/destination)
+	return FALSE
+
+//direction is direction of travel of air
+/turf/proc/zAirIn(direction, turf/source)
+	return FALSE
+
+//direction is direction of travel of air
+/turf/proc/zAirOut(direction, turf/source)
+	return FALSE
+
+/turf/proc/zImpact(atom/movable/A, levels = 1)
+	for(var/i in contents)
+		var/atom/thing = i
+		if(thing.intercept_zImpact(A, levels))
+			return FALSE
+	if(zFall(A, ++levels))
+		return FALSE
+	A.visible_message("<span class='danger'>[A] crashes into [src]!</span>")
+	A.onZImpact(src, levels)
+	return TRUE
+
+/turf/proc/can_zFall(atom/movable/A, levels = 1, turf/target)
+	return zPassOut(A, DOWN, target) && target.zPassIn(A, DOWN, src)
+
+/turf/proc/zFall(atom/movable/A, levels = 1, force = FALSE)
+	var/turf/target = get_step_multiz(src, DOWN)
+	if(!target || (!isobj(A) && !ismob(A)))
+		return FALSE
+	if(!force && (!can_zFall(A, levels, target) || !A.can_zFall(src, levels, target, DOWN)))
+		return FALSE
+	A.visible_message("<span class='danger'>[A] falls through [src]!</span>")
+	A.zfalling = TRUE
+	A.forceMove(target)
+	A.zfalling = FALSE
+	target.zImpact(A, levels)
+	return TRUE
+
 /turf/proc/handleRCL(obj/item/twohanded/rcl/C, mob/user)
 	if(C.loaded)
 		for(var/obj/structure/cable/LC in src)
@@ -196,6 +259,9 @@
 		if(O.obj_flags & FROZEN)
 			O.make_unfrozen()
 
+	if(!AM.zfalling)
+		zFall(AM)
+
 /turf/proc/is_plasteel_floor()
 	return FALSE
 
diff --git a/code/modules/atmospherics/environmental/LINDA_system.dm b/code/modules/atmospherics/environmental/LINDA_system.dm
index 084c35684c..1ad899920a 100644
--- a/code/modules/atmospherics/environmental/LINDA_system.dm
+++ b/code/modules/atmospherics/environmental/LINDA_system.dm
@@ -1,4 +1,6 @@
 /atom/var/CanAtmosPass = ATMOS_PASS_YES
+/atom/var/CanAtmosPassVertical = ATMOS_PASS_YES
+
 /atom/proc/CanAtmosPass(turf/T)
 	switch (CanAtmosPass)
 		if (ATMOS_PASS_PROC)
@@ -8,42 +10,47 @@
 		else
 			return CanAtmosPass
 
-/turf/closed/CanAtmosPass = ATMOS_PASS_NO
+/turf/CanAtmosPass = ATMOS_PASS_NO
+/turf/CanAtmosPassVertical = ATMOS_PASS_NO
 
 /turf/open/CanAtmosPass = ATMOS_PASS_PROC
-/turf/open/CanAtmosPass(turf/T)
-	var/R
-	if(blocks_air || T.blocks_air)
-		R = 1
+/turf/open/CanAtmosPassVertical = ATMOS_PASS_PROC
 
+/turf/open/CanAtmosPass(turf/T, vertical = FALSE)
+	var/dir = vertical? get_dir_multiz(src, T) : get_dir(src, T)
+	var/opp = dir_inverse_multiz(dir)
+	var/R = FALSE
+	if(vertical && !(zAirOut(dir, T) && T.zAirIn(dir, src)))
+		R = TRUE
+	if(blocks_air || T.blocks_air)
+		R = TRUE
+	if (T == src)
+		return !R
 	for(var/obj/O in contents+T.contents)
 		var/turf/other = (O.loc == src ? T : src)
-		if(!CANATMOSPASS(O, other))
-			R = 1
+		if(!(vertical? (CANVERTICALATMOSPASS(O, other)) : (CANATMOSPASS(O, other))))
+			R = TRUE
 			if(O.BlockSuperconductivity()) 	//the direction and open/closed are already checked on CanAtmosPass() so there are no arguments
-				var/D = get_dir(src, T)
-				atmos_supeconductivity |= D
-				D = get_dir(T, src)
-				T.atmos_supeconductivity |= D
-				return 0						//no need to keep going, we got all we asked
+				atmos_supeconductivity |= dir
+				T.atmos_supeconductivity |= opp
+				return FALSE						//no need to keep going, we got all we asked
 
-	atmos_supeconductivity &= ~get_dir(src, T)
-	T.atmos_supeconductivity &= ~get_dir(T, src)
+	atmos_supeconductivity &= ~dir
+	T.atmos_supeconductivity &= ~opp
 
 	return !R
 
-
-
 /atom/movable/proc/BlockSuperconductivity() // objects that block air and don't let superconductivity act. Only firelocks atm.
-	return 0
+	return FALSE
 
 /turf/proc/CalculateAdjacentTurfs()
-	var/list/atmos_adjacent_turfs = src.atmos_adjacent_turfs
-	for(var/direction in GLOB.cardinals)
-		var/turf/T = get_step(src, direction)
-		if(!T)
+	var/canpass = CANATMOSPASS(src, src)
+	var/canvpass = CANVERTICALATMOSPASS(src, src)
+	for(var/direction in GLOB.cardinals_multiz)
+		var/turf/T = get_step_multiz(src, direction)
+		if(!isopenturf(T))
 			continue
-		if( !(blocks_air || T.blocks_air) && CANATMOSPASS(T, src) )
+		if(!(blocks_air || T.blocks_air) && ((direction & (UP|DOWN))? (canvpass && CANVERTICALATMOSPASS(T, src)) : (canpass && CANATMOSPASS(T, src))) )
 			LAZYINITLIST(atmos_adjacent_turfs)
 			LAZYINITLIST(T.atmos_adjacent_turfs)
 			atmos_adjacent_turfs[T] = TRUE
@@ -72,11 +79,13 @@
 
 	var/turf/curloc = src
 
-	for (var/direction in GLOB.diagonals)
+	for (var/direction in GLOB.diagonals_multiz)
 		var/matchingDirections = 0
-		var/turf/S = get_step(curloc, direction)
+		var/turf/S = get_step_multiz(curloc, direction)
+		if(!S)
+			continue
 
-		for (var/checkDirection in GLOB.cardinals)
+		for (var/checkDirection in GLOB.cardinals_multiz)
 			var/turf/checkTurf = get_step(S, checkDirection)
 			if(!S.atmos_adjacent_turfs || !S.atmos_adjacent_turfs[checkTurf])
 				continue
diff --git a/code/modules/atmospherics/environmental/LINDA_turf_tile.dm b/code/modules/atmospherics/environmental/LINDA_turf_tile.dm
index ea555c9489..9dba780b3f 100644
--- a/code/modules/atmospherics/environmental/LINDA_turf_tile.dm
+++ b/code/modules/atmospherics/environmental/LINDA_turf_tile.dm
@@ -42,8 +42,7 @@
 
 /turf/open/Destroy()
 	if(active_hotspot)
-		qdel(active_hotspot)
-		active_hotspot = null
+		QDEL_NULL(active_hotspot)
 	// Adds the adjacent turfs to the current atmos processing
 	for(var/T in atmos_adjacent_turfs)
 		SSair.add_to_active(T)
diff --git a/code/modules/atmospherics/multiz.dm b/code/modules/atmospherics/multiz.dm
new file mode 100644
index 0000000000..2b3a9af1c7
--- /dev/null
+++ b/code/modules/atmospherics/multiz.dm
@@ -0,0 +1,29 @@
+obj/machinery/atmospherics/pipe/simple/multiz ///This is an atmospherics pipe which can relay air up a deck (Z+1). It currently only supports being on pipe layer 1
+	name = "multi deck pipe adapter"
+	desc = "An adapter which allows pipes to connect to other pipenets on different decks."
+	icon_state = "multiz_pipe"
+	icon = 'icons/obj/atmos.dmi'
+
+/obj/machinery/atmospherics/pipe/simple/multiz/update_icon()
+	. = ..()
+	cut_overlays() //This adds the overlay showing it's a multiz pipe. This should go above turfs and such
+	var/image/multiz_overlay_node = new(src) //If we have a firing state, light em up!
+	multiz_overlay_node.icon = 'icons/obj/atmos.dmi'
+	multiz_overlay_node.icon_state = "multiz_pipe"
+	multiz_overlay_node.layer = HIGH_OBJ_LAYER
+	add_overlay(multiz_overlay_node)
+
+///Attempts to locate a multiz pipe that's above us, if it finds one it merges us into its pipenet
+/obj/machinery/atmospherics/pipe/simple/multiz/pipeline_expansion()
+	icon = 'icons/obj/atmos.dmi' //Just to refresh.
+	var/turf/T = get_turf(src)
+	var/obj/machinery/atmospherics/pipe/simple/multiz/above = locate(/obj/machinery/atmospherics/pipe/simple/multiz) in(SSmapping.get_turf_above(T))
+	var/obj/machinery/atmospherics/pipe/simple/multiz/below = locate(/obj/machinery/atmospherics/pipe/simple/multiz) in(SSmapping.get_turf_below(T))
+	if(below)
+		below.pipeline_expansion() //If we've got one below us, force it to add us on facebook
+	if(above)
+		nodes += above
+		above.nodes += src //Two way travel :)
+		return ..()
+	else
+		return ..()
\ No newline at end of file
diff --git a/code/modules/mapping/ruins.dm b/code/modules/mapping/ruins.dm
index 416e2bc0c9..d88c7543f0 100644
--- a/code/modules/mapping/ruins.dm
+++ b/code/modules/mapping/ruins.dm
@@ -1,10 +1,12 @@
-/datum/map_template/ruin/proc/try_to_place(z,allowed_areas)
-	var/sanity = PLACEMENT_TRIES
+/datum/map_template/ruin/proc/try_to_place(z,allowed_areas,turf/forced_turf)
+	var/sanity = forced_turf ? 1 : PLACEMENT_TRIES
+	if(SSmapping.level_trait(z,ZTRAIT_ISOLATED_RUINS))
+		return place_on_isolated_level(z)
 	while(sanity > 0)
 		sanity--
 		var/width_border = TRANSITIONEDGE + SPACERUIN_MAP_EDGE_PAD + round(width / 2)
 		var/height_border = TRANSITIONEDGE + SPACERUIN_MAP_EDGE_PAD + round(height / 2)
-		var/turf/central_turf = locate(rand(width_border, world.maxx - width_border), rand(height_border, world.maxy - height_border), z)
+		var/turf/central_turf = forced_turf ? forced_turf : locate(rand(width_border, world.maxx - width_border), rand(height_border, world.maxy - height_border), z)
 		var/valid = TRUE
 
 		for(var/turf/check in get_affected_turfs(central_turf,1))
@@ -24,7 +26,7 @@
 				qdel(monster)
 			for(var/obj/structure/flora/ash/plant in T)
 				qdel(plant)
-		
+
 		load(central_turf,centered = TRUE)
 		loaded++
 
@@ -32,9 +34,20 @@
 			T.flags_1 |= NO_RUINS_1
 
 		new /obj/effect/landmark/ruin(central_turf, src)
-		return TRUE
-	return FALSE
+		return central_turf
 
+/datum/map_template/ruin/proc/place_on_isolated_level(z)
+	var/datum/turf_reservation/reservation = SSmapping.RequestBlockReservation(width, height, z) //Make the new level creation work with different traits.
+	if(!reservation)
+		return
+	var/turf/placement = locate(reservation.bottom_left_coords[1],reservation.bottom_left_coords[2],reservation.bottom_left_coords[3])
+	load(placement)
+	loaded++
+	for(var/turf/T in get_affected_turfs(placement))
+		T.flags_1 |= NO_RUINS_1
+	var/turf/center = locate(placement.x + round(width/2),placement.y + round(height/2),placement.z)
+	new /obj/effect/landmark/ruin(center, src)
+	return center
 
 /proc/seedRuins(list/z_levels = null, budget = 0, whitelist = /area/space, list/potentialRuins)
 	if(!z_levels || !z_levels.len)
@@ -49,9 +62,8 @@
 
 	var/list/ruins = potentialRuins.Copy()
 
-	var/list/forced_ruins = list()		//These go first on the z level associated (same random one by default)
+	var/list/forced_ruins = list()		//These go first on the z level associated (same random one by default) or if the assoc value is a turf to the specified turf.
 	var/list/ruins_availible = list()	//we can try these in the current pass
-	var/forced_z	//If set we won't pick z level and use this one instead.
 
 	//Set up the starting ruin list
 	for(var/key in ruins)
@@ -67,34 +79,55 @@
 	while(budget > 0 && (ruins_availible.len || forced_ruins.len))
 		var/datum/map_template/ruin/current_pick
 		var/forced = FALSE
+		var/forced_z	//If set we won't pick z level and use this one instead.
+		var/forced_turf //If set we place the ruin centered on the given turf
 		if(forced_ruins.len) //We have something we need to load right now, so just pick it
 			for(var/ruin in forced_ruins)
 				current_pick = ruin
-				if(forced_ruins[ruin] > 0) //Load into designated z
+				if(isturf(forced_ruins[ruin]))
+					var/turf/T = forced_ruins[ruin]
+					forced_z = T.z //In case of chained ruins
+					forced_turf = T
+				else if(forced_ruins[ruin] > 0) //Load into designated z
 					forced_z = forced_ruins[ruin]
 				forced = TRUE
 				break
 		else //Otherwise just pick random one
 			current_pick = pickweight(ruins_availible)
 
-		var/placement_tries = PLACEMENT_TRIES
+		var/placement_tries = forced_turf ? 1 : PLACEMENT_TRIES //Only try once if we target specific turf
 		var/failed_to_place = TRUE
-		var/z_placed = 0
-		while(placement_tries > 0)
-			placement_tries--
-			z_placed = pick(z_levels)
-			if(!current_pick.try_to_place(forced_z ? forced_z : z_placed,whitelist))
-				continue
-			else
-				failed_to_place = FALSE
-				break
+		var/target_z = 0
+		var/turf/placed_turf //Where the ruin ended up if we succeeded
+		outer:
+			while(placement_tries > 0)
+				placement_tries--
+				target_z = pick(z_levels)
+				if(forced_z)
+					target_z = forced_z
+				if(current_pick.always_spawn_with) //If the ruin has part below, make sure that z exists.
+					for(var/v in current_pick.always_spawn_with)
+						if(current_pick.always_spawn_with[v] == PLACE_BELOW)
+							var/turf/T = locate(1,1,target_z)
+							if(!SSmapping.get_turf_below(T))
+								if(forced_z)
+									continue outer
+								else
+									break outer
+
+				placed_turf = current_pick.try_to_place(target_z,whitelist,forced_turf)
+				if(!placed_turf)
+					continue
+				else
+					failed_to_place = FALSE
+					break
 
 		//That's done remove from priority even if it failed
 		if(forced)
 			//TODO : handle forced ruins with multiple variants
 			forced_ruins -= current_pick
 			forced = FALSE
-		
+
 		if(failed_to_place)
 			for(var/datum/map_template/ruin/R in ruins_availible)
 				if(R.id == current_pick.id)
@@ -118,18 +151,21 @@
 						if(istype(linked,v))
 							switch(current_pick.always_spawn_with[v])
 								if(PLACE_SAME_Z)
-									forced_ruins[linked] = forced_z ? forced_z : z_placed //I guess you might want a chain somehow
+									forced_ruins[linked] = target_z //I guess you might want a chain somehow
 								if(PLACE_LAVA_RUIN)
 									forced_ruins[linked] = pick(SSmapping.levels_by_trait(ZTRAIT_LAVA_RUINS))
 								if(PLACE_SPACE_RUIN)
 									forced_ruins[linked] = pick(SSmapping.levels_by_trait(ZTRAIT_SPACE_RUINS))
 								if(PLACE_DEFAULT)
 									forced_ruins[linked] = -1
-		forced_z = 0
+								if(PLACE_BELOW)
+									forced_ruins[linked] = SSmapping.get_turf_below(placed_turf)
+								if(PLACE_ISOLATED)
+									forced_ruins[linked] = SSmapping.get_isolated_ruin_z()
 
 		//Update the availible list
 		for(var/datum/map_template/ruin/R in ruins_availible)
 			if(R.cost > budget)
 				ruins_availible -= R
-	
+
 	log_world("Ruin loader finished with [budget] left to spend.")
diff --git a/code/modules/mapping/space_management/multiz_helpers.dm b/code/modules/mapping/space_management/multiz_helpers.dm
new file mode 100644
index 0000000000..f6db12420a
--- /dev/null
+++ b/code/modules/mapping/space_management/multiz_helpers.dm
@@ -0,0 +1,47 @@
+/proc/get_step_multiz(ref, dir)
+	if(dir & UP)
+		dir &= ~UP
+		return get_step(SSmapping.get_turf_above(get_turf(ref)), dir)
+	if(dir & DOWN)
+		dir &= ~DOWN
+		return get_step(SSmapping.get_turf_below(get_turf(ref)), dir)
+	return get_step(ref, dir)
+
+/proc/get_dir_multiz(turf/us, turf/them)
+	us = get_turf(us)
+	them = get_turf(them)
+	if(!us || !them)
+		return NONE
+	if(us.z == them.z)
+		return get_dir(us, them)
+	else
+		var/turf/T = us.above()
+		var/dir = NONE
+		if(T && (T.z == them.z))
+			dir = UP
+		else
+			T = us.below()
+			if(T && (T.z == them.z))
+				dir = DOWN
+			else
+				return get_dir(us, them)
+		return (dir | get_dir(us, them))
+
+/turf/proc/above()
+	return get_step_multiz(src, UP)
+
+/turf/proc/below()
+	return get_step_multiz(src, DOWN)
+
+/proc/dir_inverse_multiz(dir)
+	var/holder = dir & (UP|DOWN)
+	if((holder == NONE) || (holder == (UP|DOWN)))
+		return turn(dir, 180)
+	dir &= ~(UP|DOWN)
+	dir = turn(dir, 180)
+	if(holder == UP)
+		holder = DOWN
+	else
+		holder = UP
+	dir |= holder
+	return dir
\ No newline at end of file
diff --git a/code/modules/mob/dead/observer/observer.dm b/code/modules/mob/dead/observer/observer.dm
index d599d55886..4c2f55a3c0 100644
--- a/code/modules/mob/dead/observer/observer.dm
+++ b/code/modules/mob/dead/observer/observer.dm
@@ -17,6 +17,7 @@ GLOBAL_VAR_INIT(observer_default_invisibility, INVISIBILITY_OBSERVER)
 	see_in_dark = 100
 	invisibility = INVISIBILITY_OBSERVER
 	hud_type = /datum/hud/ghost
+	movement_type = GROUND | FLYING
 	var/can_reenter_corpse
 	var/can_reenter_round = TRUE
 	var/datum/hud/living/carbon/hud = null // hud
diff --git a/code/modules/mob/dead/observer/observer_movement.dm b/code/modules/mob/dead/observer/observer_movement.dm
new file mode 100644
index 0000000000..b84bed2a3f
--- /dev/null
+++ b/code/modules/mob/dead/observer/observer_movement.dm
@@ -0,0 +1,2 @@
+/mob/dead/observer/canZMove(direction, turf/target)
+	return TRUE
\ No newline at end of file
diff --git a/code/modules/mob/living/living.dm b/code/modules/mob/living/living.dm
index d249cd1a61..d03664a277 100644
--- a/code/modules/mob/living/living.dm
+++ b/code/modules/mob/living/living.dm
@@ -40,6 +40,16 @@
 	QDEL_LIST(diseases)
 	return ..()
 
+/mob/living/onZImpact(turf/T, levels)
+	if(!isgroundlessturf(T))
+		ZImpactDamage(T, levels)
+	return ..()
+
+/mob/living/proc/ZImpactDamage(turf/T, levels)
+	visible_message("<span class='danger'>[src] crashes into [T] with a sickening noise!</span>")
+	adjustBruteLoss((levels * 5) ** 1.5)
+	Knockdown(levels * 50)
+
 /mob/living/proc/OpenCraftingMenu()
 	return
 
diff --git a/code/modules/mob/living/living_movement.dm b/code/modules/mob/living/living_movement.dm
index 1ee563bc1f..93bb9d1f8d 100644
--- a/code/modules/mob/living/living_movement.dm
+++ b/code/modules/mob/living/living_movement.dm
@@ -32,4 +32,7 @@
 		if(drag_slowdown && L.lying && !L.buckled && grab_state < GRAB_AGGRESSIVE)
 			add_movespeed_modifier(MOVESPEED_ID_PRONE_DRAGGING, multiplicative_slowdown = PULL_PRONE_SLOWDOWN)
 			return
-	remove_movespeed_modifier(MOVESPEED_ID_PRONE_DRAGGING)
\ No newline at end of file
+	remove_movespeed_modifier(MOVESPEED_ID_PRONE_DRAGGING)
+
+/mob/living/canZMove(dir, turf/target)
+	return can_zTravel(target, dir) && (movement_type & FLYING)
\ No newline at end of file
diff --git a/code/modules/mob/mob_movement.dm b/code/modules/mob/mob_movement.dm
index 82e2b11f8e..2c8935c786 100644
--- a/code/modules/mob/mob_movement.dm
+++ b/code/modules/mob/mob_movement.dm
@@ -370,3 +370,35 @@
 	if(hud_used && hud_used.static_inventory)
 		for(var/obj/screen/mov_intent/selector in hud_used.static_inventory)
 			selector.update_icon(src)
+
+/mob/verb/up()
+	set name = "Move Upwards"
+	set category = "IC"
+
+	if(zMove(UP, TRUE))
+		to_chat(src, "<span class='notice'>You move upwards.</span>")
+
+/mob/verb/down()
+	set name = "Move Down"
+	set category = "IC"
+
+	if(zMove(DOWN, TRUE))
+		to_chat(src, "<span class='notice'>You move down.</span>")
+
+/mob/proc/zMove(dir, feedback = FALSE)
+	if(dir != UP && dir != DOWN)
+		return FALSE
+	var/turf/target = get_step_multiz(src, dir)
+	if(!target)
+		if(feedback)
+			to_chat(src, "<span class='warning'>There's nothing in that direction!</span>")
+		return FALSE
+	if(!canZMove(dir, target))
+		if(feedback)
+			to_chat(src, "<span class='warning'>You couldn't move there!</span>")
+		return FALSE
+	forceMove(target)
+	return TRUE
+
+/mob/proc/canZMove(direction, turf/target)
+	return FALSE
\ No newline at end of file
diff --git a/code/modules/power/gravitygenerator.dm b/code/modules/power/gravitygenerator.dm
index 4d8cdaa778..f2d95c2bd0 100644
--- a/code/modules/power/gravitygenerator.dm
+++ b/code/modules/power/gravitygenerator.dm
@@ -117,7 +117,7 @@ GLOBAL_LIST_EMPTY(gravity_generators) // We will keep track of this by adding ne
 	use_power = IDLE_POWER_USE
 	interaction_flags_machine = INTERACT_MACHINE_ALLOW_SILICON | INTERACT_MACHINE_OFFLINE
 	var/on = TRUE
-	var/breaker = 1
+	var/breaker = TRUE
 	var/list/parts = list()
 	var/obj/middle = null
 	var/charging_state = POWER_IDLE
@@ -166,7 +166,7 @@ GLOBAL_LIST_EMPTY(gravity_generators) // We will keep track of this by adding ne
 			M.set_broken()
 	middle.cut_overlays()
 	charge_count = 0
-	breaker = 0
+	breaker = FALSE
 	set_power()
 	set_state(0)
 	investigate_log("has broken down.", INVESTIGATE_GRAVITY)
@@ -176,7 +176,7 @@ GLOBAL_LIST_EMPTY(gravity_generators) // We will keep track of this by adding ne
 	for(var/obj/machinery/gravity_generator/M in parts)
 		if(M.stat & BROKEN)
 			M.set_fix()
-	broken_state = 0
+	broken_state = FALSE
 	update_icon()
 	set_power()
 
@@ -273,11 +273,11 @@ GLOBAL_LIST_EMPTY(gravity_generators) // We will keep track of this by adding ne
 
 // Set the charging state based on power/breaker.
 /obj/machinery/gravity_generator/main/proc/set_power()
-	var/new_state = 0
+	var/new_state = FALSE
 	if(stat & (NOPOWER|BROKEN) || !breaker)
-		new_state = 0
+		new_state = FALSE
 	else if(breaker)
-		new_state = 1
+		new_state = TRUE
 
 	charging_state = new_state ? POWER_UP : POWER_DOWN // Startup sequence animation.
 	investigate_log("is now [charging_state == POWER_UP ? "charging" : "discharging"].", INVESTIGATE_GRAVITY)
@@ -292,13 +292,13 @@ GLOBAL_LIST_EMPTY(gravity_generators) // We will keep track of this by adding ne
 	var/alert = FALSE
 	if(SSticker.IsRoundInProgress())
 		if(on) // If we turned on and the game is live.
-			if(gravity_in_level() == 0)
-				alert = 1
+			if(gravity_in_level() == FALSE)
+				alert = TRUE
 				investigate_log("was brought online and is now producing gravity for this level.", INVESTIGATE_GRAVITY)
 				message_admins("The gravity generator was brought online [ADMIN_VERBOSEJMP(src)]")
 		else
-			if(gravity_in_level() == 1)
-				alert = 1
+			if(gravity_in_level() == TRUE)
+				alert = TRUE
 				investigate_log("was brought offline and there is now no gravity for this level.", INVESTIGATE_GRAVITY)
 				message_admins("The gravity generator was brought offline with no backup generator. [ADMIN_VERBOSEJMP(src)]")
 
@@ -361,7 +361,7 @@ GLOBAL_LIST_EMPTY(gravity_generators) // We will keep track of this by adding ne
 	var/sound/alert_sound = sound('sound/effects/alert.ogg')
 	for(var/i in GLOB.mob_list)
 		var/mob/M = i
-		if(M.z != z)
+		if(M.z != z && !(SSmapping.level_trait(z, ZTRAITS_STATION) && SSmapping.level_trait(M.z, ZTRAITS_STATION)))
 			continue
 		M.update_gravity(M.mob_has_gravity())
 		if(M.client)
@@ -371,20 +371,28 @@ GLOBAL_LIST_EMPTY(gravity_generators) // We will keep track of this by adding ne
 /obj/machinery/gravity_generator/main/proc/gravity_in_level()
 	var/turf/T = get_turf(src)
 	if(!T)
-		return 0
+		return FALSE
 	if(GLOB.gravity_generators["[T.z]"])
 		return length(GLOB.gravity_generators["[T.z]"])
-	return 0
+	return FALSE
 
 /obj/machinery/gravity_generator/main/proc/update_list()
 	var/turf/T = get_turf(src.loc)
 	if(T)
-		if(!GLOB.gravity_generators["[T.z]"])
-			GLOB.gravity_generators["[T.z]"] = list()
-		if(on)
-			GLOB.gravity_generators["[T.z]"] |= src
+		var/list/z_list = list()
+		// Multi-Z, station gravity generator generates gravity on all ZTRAIT_STATION z-levels.
+		if(SSmapping.level_trait(T.z, ZTRAIT_STATION))
+			for(var/z in SSmapping.levels_by_trait(ZTRAIT_STATION))
+				z_list += z
 		else
-			GLOB.gravity_generators["[T.z]"] -= src
+			z_list += T.z
+		for(var/z in z_list)
+			if(!GLOB.gravity_generators["[z]"])
+				GLOB.gravity_generators["[z]"] = list()
+			if(on)
+				GLOB.gravity_generators["[z]"] |= src
+			else
+				GLOB.gravity_generators["[z]"] -= src
 
 /obj/machinery/gravity_generator/main/proc/change_setting(value)
 	if(value != setting)
diff --git a/code/modules/power/multiz.dm b/code/modules/power/multiz.dm
new file mode 100644
index 0000000000..9d8abf9066
--- /dev/null
+++ b/code/modules/power/multiz.dm
@@ -0,0 +1,80 @@
+/obj/machinery/power/deck_relay //This bridges powernets
+	name = "Multi-deck power adapter"
+	desc = "A huge bundle of double insulated cabling which seems to run up into the ceiling."
+	icon = 'icons/obj/power.dmi'
+	icon_state = "cablerelay-off"
+	var/obj/machinery/power/deck_relay/below ///The relay that's below us (for bridging powernets)
+	var/obj/machinery/power/deck_relay/above ///The relay that's above us (for bridging powernets)
+	anchored = TRUE
+	density = FALSE
+
+/obj/machinery/power/deck_relay/attackby(obj/item/I,mob/user)
+	if(default_unfasten_wrench(user, I))
+		return FALSE
+	. = ..()
+
+/obj/machinery/power/deck_relay/process()
+	if(!anchored)
+		icon_state = "cablerelay-off"
+		if(above) //Lose connections
+			above.below = null
+		if(below)
+			below.above = null
+		return
+	refresh() //Sometimes the powernets get lost, so we need to keep checking.
+	if(powernet && (powernet.avail <= 0))		// is it powered?
+		icon_state = "cablerelay-off"
+	else
+		icon_state = "cablerelay-on"
+	if(!below || QDELETED(below) || !above || QDELETED(above))
+		icon_state = "cablerelay-off"
+		find_relays()
+
+///Allows you to scan the relay with a multitool to see stats.
+/obj/machinery/power/deck_relay/multitool_act(mob/user, obj/item/I)
+	if(powernet && (powernet.avail > 0))		// is it powered?
+		to_chat(user, "<span class='danger'>Total power: [DisplayPower(powernet.avail)]\nLoad: [DisplayPower(powernet.load)]\nExcess power: [DisplayPower(surplus())]</span>")
+	if(!powernet || below.powernet != powernet)
+		icon_state = "cablerelay-off"
+		to_chat(user, "<span class='danger'>Powernet connection lost. Attempting to re-establish. Ensure the relays below this one are connected too.</span>")
+		find_relays()
+		addtimer(CALLBACK(src, .proc/refresh), 20) //Wait a bit so we can find the one below, then get powering
+	return TRUE
+
+/obj/machinery/power/deck_relay/Initialize()
+	. = ..()
+	addtimer(CALLBACK(src, .proc/find_relays), 30)
+	addtimer(CALLBACK(src, .proc/refresh), 50) //Wait a bit so we can find the one below, then get powering
+
+///Handles re-acquiring + merging powernets found by find_relays()
+/obj/machinery/power/deck_relay/proc/refresh()
+	if(above)
+		above.merge(src)
+	if(below)
+		below.merge(src)
+
+/obj/machinery/power/deck_relay/proc/merge(var/obj/machinery/power/deck_relay/DR)
+	if(!DR)
+		return
+	var/turf/merge_from = get_turf(DR)
+	var/turf/merge_to = get_turf(src)
+	var/obj/structure/cable/C = merge_from.get_cable_node()
+	var/obj/structure/cable/XR = merge_to.get_cable_node()
+	if(C && XR)
+		merge_powernets(XR.powernet,C.powernet)//Bridge the powernets.
+
+///Locates relays that are above and below this object
+/obj/machinery/power/deck_relay/proc/find_relays()
+	var/turf/T = get_turf(src)
+	if(!T || !istype(T))
+		return FALSE
+	below = null //in case we're re-establishing
+	var/obj/structure/cable/C = T.get_cable_node() //check if we have a node cable on the machine turf, the first found is picked
+	if(C && C.powernet)
+		C.powernet.add_machine(src) //Nice we're in.
+		powernet = C.powernet
+	below = locate(/obj/machinery/power/deck_relay) in(SSmapping.get_turf_below(T))
+	above = locate(/obj/machinery/power/deck_relay) in(SSmapping.get_turf_above(T))
+	if(below || above)
+		icon_state = "cablerelay-on"
+	return TRUE
\ No newline at end of file
diff --git a/code/modules/power/supermatter/supermatter.dm b/code/modules/power/supermatter/supermatter.dm
index e6fa1e0ee4..1b3a2a716c 100644
--- a/code/modules/power/supermatter/supermatter.dm
+++ b/code/modules/power/supermatter/supermatter.dm
@@ -650,6 +650,9 @@ GLOBAL_DATUM(main_supermatter_engine, /obj/machinery/power/supermatter_crystal)
 
 	Consume(AM)
 
+/obj/machinery/power/supermatter_crystal/intercept_zImpact(atom/movable/AM, levels)
+	Bumped(AM)
+
 /obj/machinery/power/supermatter_crystal/proc/Consume(atom/movable/AM)
 	if(isliving(AM))
 		var/mob/living/user = AM
diff --git a/code/modules/reagents/chemistry/reagents/food_reagents.dm b/code/modules/reagents/chemistry/reagents/food_reagents.dm
index 056c5b1901..094c20b8ff 100644
--- a/code/modules/reagents/chemistry/reagents/food_reagents.dm
+++ b/code/modules/reagents/chemistry/reagents/food_reagents.dm
@@ -138,7 +138,7 @@
 	return TRUE
 
 /datum/reagent/consumable/cooking_oil/reaction_turf(turf/open/T, reac_volume)
-	if(!istype(T))
+	if(!istype(T) || isgroundlessturf(T))
 		return
 	if(reac_volume >= 5)
 		T.MakeSlippery(TURF_WET_LUBE, min_wet_time = 10 SECONDS, wet_time_to_add = reac_volume * 1.5 SECONDS)
diff --git a/code/modules/recycling/disposal/multiz.dm b/code/modules/recycling/disposal/multiz.dm
new file mode 100644
index 0000000000..3dcab94ca5
--- /dev/null
+++ b/code/modules/recycling/disposal/multiz.dm
@@ -0,0 +1,49 @@
+#define MULTIZ_PIPE_UP 1 ///Defines for determining which way a multiz disposal element should travel
+#define MULTIZ_PIPE_DOWN 2 ///Defines for determining which way a multiz disposal element should travel
+
+
+/obj/structure/disposalpipe/trunk/multiz
+	name = "Disposal trunk that goes up"
+	icon_state = "pipe-up"
+	var/multiz_dir = MULTIZ_PIPE_UP ///Set the multiz direction of your trunk. 1 = up, 2 = down
+
+/obj/structure/disposalpipe/trunk/multiz/down
+	name = "Disposal trunk that goes down"
+	icon_state = "pipe-down"
+	multiz_dir = MULTIZ_PIPE_DOWN
+
+/obj/structure/disposalpipe/trunk/multiz/transfer(obj/structure/disposalholder/H)
+	if(H.dir == DOWN)		//Since we're a trunk, you can still place a chute / bin over us. If theyve entered from there, treat this as a normal trunk
+		return ..()
+	// otherwise, go to the linked object
+	if(multiz_dir) //Are we a trunk that goes up? Or down?
+		var/turf/T = null
+		if(multiz_dir == MULTIZ_PIPE_UP)
+			T = SSmapping.get_turf_above(get_turf(src)) //Get the turf above us
+		if(multiz_dir == MULTIZ_PIPE_DOWN)
+			T = SSmapping.get_turf_below(get_turf(src))
+		if(!T)
+			expel(H)
+			return //Nothing located.
+		var/obj/structure/disposalpipe/trunk/multiz/pipe = locate(/obj/structure/disposalpipe/trunk/multiz) in T
+		if(pipe)
+			var/obj/structure/disposalholder/destination = new(pipe) //For future reference, the disposal holder is the thing that carries mobs
+			destination.init(pipe) //This instantiates it
+			destination.merge(H) //This takes the contents of H (Our disposal holder that's travelling into us) and puts them into the destination holder
+			destination.active = TRUE //Active allows it to process and move
+			destination.setDir(DOWN) //This tells the trunk above us NOT to loop it back down to us, or else you get an infinite loop
+			destination.move()
+			return null //Which removes the disposalholder
+	else
+		var/obj/structure/disposaloutlet/O = linked
+		if(istype(O))
+			O.expel(H)	// expel at outlet
+		else
+			var/obj/machinery/disposal/D = linked
+			D.expel(H)	// expel at disposal
+
+	// Returning null without expelling holder makes the holder expell itself
+	return null
+
+#undef MULTIZ_PIPE_UP
+#undef MULTIZ_PIPE_DOWN
\ No newline at end of file
diff --git a/code/modules/shuttle/shuttle.dm b/code/modules/shuttle/shuttle.dm
index 307e714316..225ca1f824 100644
--- a/code/modules/shuttle/shuttle.dm
+++ b/code/modules/shuttle/shuttle.dm
@@ -33,6 +33,9 @@
 	else
 		return QDEL_HINT_LETMELIVE
 
+/obj/docking_port/has_gravity(turf/T)
+	return FALSE
+
 /obj/docking_port/take_damage()
 	return
 
diff --git a/config/maps.txt b/config/maps.txt
index 99a4543853..372f062260 100644
--- a/config/maps.txt
+++ b/config/maps.txt
@@ -35,4 +35,7 @@ map deltastation
 endmap
 
 map runtimestation
+endmap
+
+map multiz_debug
 endmap
\ No newline at end of file
diff --git a/icons/obj/atmos.dmi b/icons/obj/atmos.dmi
index ee42e95dd2..644c32fe30 100644
Binary files a/icons/obj/atmos.dmi and b/icons/obj/atmos.dmi differ
diff --git a/icons/obj/atmospherics/pipes/disposal.dmi b/icons/obj/atmospherics/pipes/disposal.dmi
index a705b35c5a..f8f16ba86f 100644
Binary files a/icons/obj/atmospherics/pipes/disposal.dmi and b/icons/obj/atmospherics/pipes/disposal.dmi differ
diff --git a/icons/obj/power.dmi b/icons/obj/power.dmi
index dc6d4547b4..1da5a66546 100644
Binary files a/icons/obj/power.dmi and b/icons/obj/power.dmi differ
diff --git a/icons/obj/stairs.dmi b/icons/obj/stairs.dmi
new file mode 100644
index 0000000000..615e88f684
Binary files /dev/null and b/icons/obj/stairs.dmi differ
diff --git a/tgstation.dme b/tgstation.dme
index 3daee9d346..99689784f4 100755
--- a/tgstation.dme
+++ b/tgstation.dme
@@ -1022,6 +1022,7 @@
 #include "code\game\objects\structures\safe.dm"
 #include "code\game\objects\structures\showcase.dm"
 #include "code\game\objects\structures\spirit_board.dm"
+#include "code\game\objects\structures\stairs.dm"
 #include "code\game\objects\structures\statues.dm"
 #include "code\game\objects\structures\table_frames.dm"
 #include "code\game\objects\structures\tables_racks.dm"
@@ -1076,6 +1077,7 @@
 #include "code\game\turfs\closed.dm"
 #include "code\game\turfs\open.dm"
 #include "code\game\turfs\turf.dm"
+#include "code\game\turfs\openspace\openspace.dm"
 #include "code\game\turfs\simulated\chasm.dm"
 #include "code\game\turfs\simulated\dirtystation.dm"
 #include "code\game\turfs\simulated\floor.dm"
@@ -1355,6 +1357,7 @@
 #include "code\modules\assembly\signaler.dm"
 #include "code\modules\assembly\timer.dm"
 #include "code\modules\assembly\voice.dm"
+#include "code\modules\atmospherics\multiz.dm"
 #include "code\modules\atmospherics\environmental\LINDA_fire.dm"
 #include "code\modules\atmospherics\environmental\LINDA_system.dm"
 #include "code\modules\atmospherics\environmental\LINDA_turf_tile.dm"
@@ -1909,6 +1912,7 @@
 #include "code\modules\mapping\reader.dm"
 #include "code\modules\mapping\ruins.dm"
 #include "code\modules\mapping\verify.dm"
+#include "code\modules\mapping\space_management\multiz_helpers.dm"
 #include "code\modules\mapping\space_management\space_level.dm"
 #include "code\modules\mapping\space_management\space_reservation.dm"
 #include "code\modules\mapping\space_management\space_transition.dm"
@@ -1994,6 +1998,7 @@
 #include "code\modules\mob\dead\observer\logout.dm"
 #include "code\modules\mob\dead\observer\notificationprefs.dm"
 #include "code\modules\mob\dead\observer\observer.dm"
+#include "code\modules\mob\dead\observer\observer_movement.dm"
 #include "code\modules\mob\dead\observer\say.dm"
 #include "code\modules\mob\living\blood.dm"
 #include "code\modules\mob\living\bloodcrawl.dm"
@@ -2390,6 +2395,7 @@
 #include "code\modules\power\gravitygenerator.dm"
 #include "code\modules\power\lighting.dm"
 #include "code\modules\power\monitor.dm"
+#include "code\modules\power\multiz.dm"
 #include "code\modules\power\port_gen.dm"
 #include "code\modules\power\power.dm"
 #include "code\modules\power\powernet.dm"
@@ -2597,6 +2603,7 @@
 #include "code\modules\recycling\disposal\construction.dm"
 #include "code\modules\recycling\disposal\eject.dm"
 #include "code\modules\recycling\disposal\holder.dm"
+#include "code\modules\recycling\disposal\multiz.dm"
 #include "code\modules\recycling\disposal\outlet.dm"
 #include "code\modules\recycling\disposal\pipe.dm"
 #include "code\modules\recycling\disposal\pipe_sorting.dm"