Continues work on the surface map

code/game/objects/effects/zone_divider.dm

@@ -0,0 +1,20 @@
+// This artificially splits a ZAS zone, useful if you wish to prevent massive super-zones which can cause lag.
+/obj/effect/zone_divider
+	name = "zone divider"
+	icon = 'icons/mob/screen1.dmi'
+	icon_state = "x3"
+	invisibility = 101 		//nope, can't see this
+	anchored = 1
+	density = 0
+	opacity = 0
+
+/obj/effect/zone_divider/CanPass(atom/movable/mover, turf/target, height=0, air_group=0)
+ 	// Special case to prevent us from being part of a zone during the first air master tick.
+ 	// We must merge ourselves into a zone on next tick.  This will cause a bit of lag on
+ 	// startup, but it can't really be helped you know?
+	if(air_master && air_master.current_cycle == 0)
+		spawn(1)
+			air_master.mark_for_update(get_turf(src))
+		return 0
+	return !air_group // Anything except zones can pass
+

code/game/objects/structures/door_assembly.dm

@@ -107,6 +107,16 @@
 	airlock_type = "/highsecurity"
 	glass = -1
 
+/obj/structure/door_assembly/door_assembly_voidcraft
+	base_icon_state = "voidcraft"
+	base_name = "voidcraft hatch"
+	airlock_type = "/voidcraft"
+	glass = -1
+
+/obj/structure/door_assembly/door_assembly_voidcraft/vertical
+	base_icon_state = "voidcraft_vertical"
+	airlock_type = "/voidcraft/vertical"
+
 /obj/structure/door_assembly/multi_tile
 	icon = 'icons/obj/doors/door_assembly2x1.dmi'
 	dir = EAST