diff --git a/baystation12.dme b/baystation12.dme
index f58c6eba48c..f092d22a12b 100644
--- a/baystation12.dme
+++ b/baystation12.dme
@@ -140,6 +140,7 @@
 #define FILE_DIR "code/unused/pda2"
 #define FILE_DIR "code/unused/spacecraft"
 #define FILE_DIR "code/WorkInProgress"
+#define FILE_DIR "code/WorkInProgress/Cael_Aislinn"
 #define FILE_DIR "code/WorkInProgress/mapload"
 #define FILE_DIR "code/WorkInProgress/Mini"
 #define FILE_DIR "code/WorkInProgress/organs"
@@ -999,6 +1000,7 @@
 #include "code\WorkInProgress\buildmode.dm"
 #include "code\WorkInProgress\detective_work.dm"
 #include "code\WorkInProgress\explosion_particles.dm"
+#include "code\WorkInProgress\Cael_Aislinn\MultiZ.dm"
 #include "code\WorkInProgress\mapload\dmm_suite.dm"
 #include "code\WorkInProgress\mapload\reader.dm"
 #include "code\WorkInProgress\Mini\atmos_control.dm"
diff --git a/code/WorkInProgress/Cael_Aislinn/MultiZ.dm b/code/WorkInProgress/Cael_Aislinn/MultiZ.dm
new file mode 100644
index 00000000000..2e12e95b983
--- /dev/null
+++ b/code/WorkInProgress/Cael_Aislinn/MultiZ.dm
@@ -0,0 +1,189 @@
+/obj/multiz
+	icon = 'multiz.dmi'
+	density = 0
+	opacity = 0
+	anchored = 1
+	var/istop = 1
+
+	CanPass(obj/mover, turf/source, height, airflow)
+		return airflow || !density
+
+/obj/multiz/proc/targetZ()
+	return src.z + (istop ? 1 : -1)
+
+/obj/multiz/ladder
+	icon_state = "ladderdown"
+	name = "ladder"
+	desc = "A Ladder.  You climb up and down it."
+
+/obj/multiz/ladder/New()
+	..()
+	if (!istop)
+		icon_state = "ladderup"
+	else
+		icon_state = "ladderdown"
+
+/obj/multiz/ladder/attack_paw(var/mob/M)
+	return attack_hand(M)
+
+/obj/multiz/ladder/attackby(var/W, var/mob/M)
+	return attack_hand(M)
+
+/obj/multiz/ladder/attack_hand(var/mob/M)
+	M.Move(locate(src.x, src.y, targetZ()))
+/*
+/obj/multiz/ladder/blob_act()
+	var/newblob = 1
+	for(var/obj/blob in locate(src.x, src.y, targetZ()))
+		newblob = 0
+	if(newblob)
+		new /obj/blob(locate(src.x, src.y, targetZ()))
+*/
+//Stairs.  var/dir on all four component objects should be the dir you'd walk from top to bottom
+//active = bump to move down
+//active/bottom = bump to move up
+//enter = decorative downwards stairs
+//enter/bottom = decorative upward stairs
+/obj/multiz/stairs
+	name = "Stairs"
+	desc = "Stairs.  You walk up and down them."
+	icon_state = "ramptop"
+
+/obj/multiz/stairs/New()
+	icon_state = istop ^ istype(src, /obj/multiz/stairs/active) ? "ramptop" : "rampbottom"
+
+/obj/multiz/stairs/enter/bottom
+	istop = 0
+
+/obj/multiz/stairs/active
+	density = 1
+
+/obj/multiz/stairs/active/Bumped(var/atom/movable/M)
+	if(istype(src, /obj/multiz/stairs/active/bottom) && !locate(/obj/multiz/stairs/enter) in M.loc)
+		return //If on bottom, only let them go up stairs if they've moved to the entry tile first.
+	//If it's the top, they can fall down just fine.
+	if(ismob(M) && M:client)
+		M:client.moving = 1
+	M.Move(locate(src.x, src.y, targetZ()))
+	if (ismob(M) && M:client)
+		M:client.moving = 0
+
+/obj/multiz/stairs/active/Click()
+	if(!istype(usr,/mob/dead/observer))
+		return ..()
+	usr.client.moving = 1
+	usr.Move(locate(src.x, src.y, targetZ()))
+	usr.client.moving = 0
+/obj/multiz/stairs/active/bottom
+	istop = 0
+	opacity = 1
+
+/turf/simulated/floor/open
+	name = "open space"
+	intact = 0
+	icon_state = "open"
+	pathweight = 100000 //Seriously, don't try and path over this one numbnuts
+	var/icon/darkoverlays = null
+	var/turf/floorbelow
+	//floorstrength = 1
+	mouse_opacity = 2
+
+	New()
+		..()
+		spawn(1)
+			if(!istype(src, /turf/simulated/floor/open)) //This should not be needed but is.
+				return
+			floorbelow = locate(x, y, z + 1)
+			if(floorbelow)
+				//Fortunately, I've done this before. - Aryn
+				if(istype(floorbelow,/turf/space) || floorbelow.z > 4)
+					new/turf/space(src)
+				else if(!istype(floorbelow,/turf/simulated/floor))
+					new/turf/simulated/floor/plating(src)
+				else
+					//if(ticker)
+						//find_zone()
+					update()
+			else
+				new/turf/space(src)
+
+	Del()
+		. = ..()
+
+	Enter(var/atom/movable/AM)
+		if (..()) //TODO make this check if gravity is active (future use) - Sukasa
+			spawn(1)
+				if(AM)
+					AM.Move(locate(x, y, z + 1))
+					if (istype(AM, /mob))
+						AM:bruteloss += 20 //You were totally doin it wrong. 5 damage? Really? - Aryn
+						AM:weakened = max(AM:weakened,5)
+						AM:updatehealth()
+		return ..()
+
+	attackby()
+		//nothing
+
+	proc/update() //Update the overlayss to make the openspace turf show what's down a level
+		if(!floorbelow) return
+		/*src.clearoverlays()
+		src.addoverlay(floorbelow)
+		for(var/obj/o in floorbelow.contents)
+			src.addoverlay(image(o, dir=o.dir, layer = TURF_LAYER+0.05*o.layer))
+		var/image/I = image('ULIcons.dmi', "[min(max(floorbelow.LightLevelRed - 4, 0), 7)]-[min(max(floorbelow.LightLevelGreen - 4, 0), 7)]-[min(max(floorbelow.LightLevelBlue - 4, 0), 7)]")
+		I.layer = TURF_LAYER + 0.2
+		src.addoverlay(I)
+		I = image('ULIcons.dmi', "1-1-1")
+		I.layer = TURF_LAYER + 0.2
+		src.addoverlay(I)*/
+
+var/maxZ = 1
+var/minZ = 1
+
+// Maybe it's best to have this hardcoded for whatever we'd add to the map, in order to avoid exploits
+// (such as mining base => admin station)
+// Note that this assumes the ship's top is at z=1 and bottom at z=4
+/obj/item/weapon/tank/jetpack/proc/move_z(cardinal, mob/user as mob)
+	if (user.z > 1)
+		user << "\red There is nothing of interest in that direction."
+		return
+	if(allow_thrust(0.01, user))
+		switch(cardinal)
+			if (UP) // Going up!
+				if(user.z > maxZ) // If we aren't at the very top of the ship
+					var/turf/T = locate(user.x, user.y, user.z - 1)
+					// You can only jetpack up if there's space above, and you're sitting on either hull (on the exterior), or space
+					//if(T && istype(T, /turf/space) && (istype(user.loc, /turf/space) || istype(user.loc, /turf/space/*/hull*/)))
+					//check through turf contents to make sure there's nothing blocking the way
+					if(T && istype(T, /turf/space))
+						var/blocked = 0
+						for(var/atom/A in T.contents)
+							if(T.density)
+								blocked = 1
+								user << "\red You bump into [T.name]."
+								break
+						if(!blocked)
+							user.Move(T)
+					else
+						user << "\red You bump into the ship's plating."
+				else
+					user << "\red The ship's gravity well keeps you in orbit!" // Assuming the ship starts on z level 1, you don't want to go past it
+
+			if (DOWN) // Going down!
+				if (user.z < 1) // If we aren't at the very bottom of the ship, or out in space
+					var/turf/T = locate(user.x, user.y, user.z + 1)
+					// You can only jetpack down if you're sitting on space and there's space down below, or hull
+					if(T && (istype(T, /turf/space) || istype(T, /turf/space/*/hull*/)) && istype(user.loc, /turf/space))
+						var/blocked = 0
+						for(var/atom/A in T.contents)
+							if(T.density)
+								blocked = 1
+								user << "\red You bump into [T.name]."
+								break
+						if(!blocked)
+							user.Move(T)
+					else
+						user << "\red You bump into the ship's plating."
+				else
+					user << "\red The ship's gravity well keeps you in orbit!"
+
diff --git a/code/WorkInProgress/Cael_Aislinn/multiz.dmi b/code/WorkInProgress/Cael_Aislinn/multiz.dmi
new file mode 100644
index 00000000000..8e7e6d03102
Binary files /dev/null and b/code/WorkInProgress/Cael_Aislinn/multiz.dmi differ
diff --git a/code/WorkInProgress/Cael_Aislinn/multiz_pipe.dmi b/code/WorkInProgress/Cael_Aislinn/multiz_pipe.dmi
new file mode 100644
index 00000000000..a3bbbee0b28
Binary files /dev/null and b/code/WorkInProgress/Cael_Aislinn/multiz_pipe.dmi differ