diff --git a/_maps/map_files/debug/multiz.dmm b/_maps/map_files/debug/multiz.dmm
new file mode 100644
index 000000000000..a228f2b1b328
--- /dev/null
+++ b/_maps/map_files/debug/multiz.dmm
@@ -0,0 +1,10082 @@
+//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/plating,
+/area/engine/engineering)
+"aq" = (
+/obj/machinery/computer/monitor,
+/obj/structure/cable{
+	icon_state = "2-8"
+	},
+/turf/open/floor/plating,
+/area/engine/engineering)
+"ar" = (
+/obj/structure/closet/secure_closet/engineering_welding,
+/turf/open/floor/plating,
+/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"
+	},
+/turf/open/floor/plating,
+/area/engine/engineering)
+"aE" = (
+/obj/structure/cable{
+	icon_state = "1-2"
+	},
+/obj/structure/cable{
+	icon_state = "2-8"
+	},
+/turf/open/floor/plating,
+/area/engine/engineering)
+"aF" = (
+/turf/open/floor/plating,
+/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/plating,
+/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/plating,
+/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" = (
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+(46,1,3) = {"
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+(48,1,3) = {"
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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 000000000000..0521fef59d30
--- /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 000000000000..6e31e510179b
--- /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 11b742a9152e..a873e22d2ce4 100644
--- a/code/__DEFINES/atmospherics.dm
+++ b/code/__DEFINES/atmospherics.dm
@@ -147,7 +147,9 @@
 #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 ) )
 
 //OPEN TURF ATMOS
 #define OPENTURF_DEFAULT_ATMOS		"o2=22;n2=82;TEMP=293.15" //the default air mix that open turfs spawn
diff --git a/code/__DEFINES/components.dm b/code/__DEFINES/components.dm
index 96518e3912a8..fce08761514f 100644
--- a/code/__DEFINES/components.dm
+++ b/code/__DEFINES/components.dm
@@ -103,6 +103,8 @@
 // /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/layers.dm b/code/__DEFINES/layers.dm
index 8891c06f750b..08ffee272c0f 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
@@ -82,11 +83,15 @@
 #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 BYOND_LIGHTING_PLANE 18
+#define BYOND_LIGHTING_LAYER 18
+
+#define CAMERA_STATIC_PLANE 19
+#define CAMERA_STATIC_LAYER 19
 
-#define CAMERA_STATIC_PLANE 18
-#define CAMERA_STATIC_LAYER 18
 //HUD layer defines
 
 #define FULLSCREEN_PLANE 19
diff --git a/code/_globalvars/lists/mapping.dm b/code/_globalvars/lists/mapping.dm
index e5dd5d04f524..3ad960e2c16a 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 5bdf61f75d33..6e8b3ac6d73d 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/game/atoms.dm b/code/game/atoms.dm
index c51e47a9e860..7a5887e15dcf 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
@@ -728,3 +732,6 @@ Proc for attack log creation, because really why not
 /atom/movable/proc/get_filter(name)
 	if(filter_data && filter_data[name])
 		return filters[filter_data.Find(name)]
+
+/atom/proc/intercept_zImpact(atom/movable/AM, levels = 1)
+	return FALSE
diff --git a/code/game/atoms_movable.dm b/code/game/atoms_movable.dm
index 160ea43a4f41..3075b0726204 100644
--- a/code/game/atoms_movable.dm
+++ b/code/game/atoms_movable.dm
@@ -36,6 +36,51 @@
 	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/effects.dm b/code/game/objects/effects/effects.dm
index ccde9c2254d2..6057d1b41806 100644
--- a/code/game/objects/effects/effects.dm
+++ b/code/game/objects/effects/effects.dm
@@ -58,6 +58,9 @@
 /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/stairs.dm b/code/game/objects/structures/stairs.dm
new file mode 100644
index 000000000000..e28f6ef0ec69
--- /dev/null
+++ b/code/game/objects/structures/stairs.dm
@@ -0,0 +1,111 @@
+#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/datum/component/redirect/multiz_signal_listener
+
+/obj/structure/stairs/Initialize(mapload)
+	if(force_open_above)
+		force_open_above()
+		build_signal_listener()
+	update_surrounding()
+	return ..()
+
+/obj/structure/stairs/Destroy()
+	QDEL_NULL(multiz_signal_listener)
+	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(isliving(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.
+		AM.forceMove(target)
+
+/obj/structure/stairs/vv_edit_var(var_name, var_value)
+	. = ..()
+	if(.)
+		if(var_name == NAMEOF(src, force_open_above))
+			if(!var_value)
+				QDEL_NULL(multiz_signal_listener)
+			else
+				build_signal_listener()
+				force_open_above()
+
+/obj/structure/stairs/proc/build_signal_listener()
+	QDEL_NULL(multiz_signal_listener)
+	var/turf/open/openspace/T = get_step_multiz(get_turf(src), UP)
+	multiz_signal_listener = T.AddComponent(/datum/component/redirect, list(COMSIG_TURF_MULTIZ_NEW = CALLBACK(src, .proc/on_multiz_new)))
+
+/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 a9699fdc3653..5308b0b04eda 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/indestructible
 	name = "floor"
 	icon = 'icons/turf/floors.dmi'
@@ -157,43 +173,14 @@
 	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 000000000000..0f408b83d21d
--- /dev/null
+++ b/code/game/turfs/openspace/openspace.dm
@@ -0,0 +1,108 @@
+/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)
+	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>")
diff --git a/code/game/turfs/space/space.dm b/code/game/turfs/space/space.dm
index 9ebe8f3c190c..3e2f90c7c94a 100644
--- a/code/game/turfs/space/space.dm
+++ b/code/game/turfs/space/space.dm
@@ -19,7 +19,6 @@
 	dynamic_lighting = DYNAMIC_LIGHTING_DISABLED
 	bullet_bounce_sound = null
 
-
 /turf/open/space/basic/New()	//Do not convert to Initialize
 	//This is used to optimize the map loader
 	return
diff --git a/code/game/turfs/turf.dm b/code/game/turfs/turf.dm
index c672f00fe9ed..d3c49ab8b34c 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)
@@ -193,6 +256,8 @@
 		var/obj/O = AM
 		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 084c35684cd5..828008baa008 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 +10,45 @@
 		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
+/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 = 1
+		R = TRUE
 
 	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)
+	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))? (CANVERTICALATMOSPASS(T, src)) : (CANATMOSPASS(T, src))) )
 			LAZYINITLIST(atmos_adjacent_turfs)
 			LAZYINITLIST(T.atmos_adjacent_turfs)
 			atmos_adjacent_turfs[T] = TRUE
@@ -72,11 +77,13 @@
 
 	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 b88efc6c6826..667dca7fb9ec 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/mapping/space_management/multiz_helpers.dm b/code/modules/mapping/space_management/multiz_helpers.dm
new file mode 100644
index 000000000000..04415d0c1fd6
--- /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
diff --git a/code/modules/mob/dead/observer/observer.dm b/code/modules/mob/dead/observer/observer.dm
index a77df079a915..fe9ea2ce29dc 100644
--- a/code/modules/mob/dead/observer/observer.dm
+++ b/code/modules/mob/dead/observer/observer.dm
@@ -15,6 +15,7 @@ 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/datum/hud/living/carbon/hud = null // hud
 	var/bootime = 0
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 000000000000..7ed0c9d9eecd
--- /dev/null
+++ b/code/modules/mob/dead/observer/observer_movement.dm
@@ -0,0 +1,2 @@
+/mob/dead/observer/canZMove(direction, turf/target)
+	return TRUE
diff --git a/code/modules/mob/living/living.dm b/code/modules/mob/living/living.dm
index c6e465888a02..93072762a60c 100644
--- a/code/modules/mob/living/living.dm
+++ b/code/modules/mob/living/living.dm
@@ -40,6 +40,15 @@
 	QDEL_LIST(diseases)
 	return ..()
 
+/mob/living/onZImpact(turf/T, levels)
+	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 16c3aa6050b5..4cf5fd27496b 100644
--- a/code/modules/mob/living/living_movement.dm
+++ b/code/modules/mob/living/living_movement.dm
@@ -25,3 +25,9 @@
 		add_movespeed_modifier(MOVESPEED_ID_LIVING_TURF_SPEEDMOD, TRUE, 100, override = TRUE, multiplicative_slowdown = T.slowdown)
 	else
 		remove_movespeed_modifier(MOVESPEED_ID_LIVING_TURF_SPEEDMOD)
+
+/mob/living/can_zFall(turf/T, levels)
+	return !(movement_type & FLYING)
+
+/mob/living/canZMove(dir, turf/target)
+	return can_zTravel(target, dir) && (movement_type & FLYING)
diff --git a/code/modules/mob/mob_movement.dm b/code/modules/mob/mob_movement.dm
index 6d6ab46ee00c..0488e7da4430 100644
--- a/code/modules/mob/mob_movement.dm
+++ b/code/modules/mob/mob_movement.dm
@@ -373,3 +373,35 @@
 	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
diff --git a/code/modules/shuttle/shuttle.dm b/code/modules/shuttle/shuttle.dm
index f9011930bed5..16d09ed952a8 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 1878a625e354..403151483e5a 100644
--- a/config/maps.txt
+++ b/config/maps.txt
@@ -42,3 +42,6 @@ endmap
 
 map runtimestation
 endmap
+
+map multiz_debug
+endmap
diff --git a/icons/obj/stairs.dmi b/icons/obj/stairs.dmi
new file mode 100644
index 000000000000..615e88f68455
Binary files /dev/null and b/icons/obj/stairs.dmi differ
diff --git a/icons/turf/floors.dmi b/icons/turf/floors.dmi
index 518adfc7661d..08783a9f708a 100644
Binary files a/icons/turf/floors.dmi and b/icons/turf/floors.dmi differ
diff --git a/tgstation.dme b/tgstation.dme
index 65f5402f717b..7756fc39c746 100644
--- a/tgstation.dme
+++ b/tgstation.dme
@@ -14,6 +14,7 @@
 
 // BEGIN_INCLUDE
 #include "_maps\_basemap.dm"
+#include "_maps\multiz_debug.dm"
 #include "code\_compile_options.dm"
 #include "code\world.dm"
 #include "code\__DEFINES\_globals.dm"
@@ -995,6 +996,7 @@
 #include "code\game\objects\structures\showcase.dm"
 #include "code\game\objects\structures\spawner.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"
@@ -1050,6 +1052,7 @@
 #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"
@@ -1782,6 +1785,7 @@
 #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"
@@ -1848,6 +1852,7 @@
 #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"