Gave the beach an edge instead of endless void.

code/controllers/Processes/timer.dm

@@ -1,4 +1,4 @@
-var/global/datum/controller/process/timer/PStimer
+var/global/datum/controller/process/timer/timer_controller
 
 /datum/controller/process/timer
 	var/list/processing_timers = list()
@@ -7,7 +7,7 @@ var/global/datum/controller/process/timer/PStimer
 /datum/controller/process/timer/setup()
 	name = "timer"
 	schedule_interval = 5 //every 0.5 seconds
-	PStimer = src
+	timer_controller = src
 
 /datum/controller/process/timer/statProcess()
 	..()
@@ -44,17 +44,17 @@ var/global/datum/controller/process/timer/PStimer
 	nextid++
 
 /datum/timedevent/Destroy()
-	PStimer.processing_timers -= src
-	PStimer.hashes -= hash
+	timer_controller.processing_timers -= src
+	timer_controller.hashes -= hash
 	return QDEL_HINT_IWILLGC
 
 /proc/addtimer(thingToCall, procToCall, wait, unique = FALSE, ...)
-	if(!PStimer) //can't run timers before the mc has been created
+	if(!timer_controller) //can't run timers before the mc has been created
 		return
 	if(!thingToCall || !procToCall || wait <= 0)
 		return
-	if(PStimer.disabled)
-		PStimer.disabled = 0
+	if(timer_controller.disabled)
+		timer_controller.disabled = 0
 
 	var/datum/timedevent/event = new()
 	event.thingToCall = thingToCall
@@ -66,15 +66,15 @@ var/global/datum/controller/process/timer/PStimer
 
 	// Check for dupes if unique = 1.
 	if(unique)
-		if(event.hash in PStimer.hashes)
+		if(event.hash in timer_controller.hashes)
 			return
 	// If we are unique (or we're not checking that), add the timer and return the id.
-	PStimer.processing_timers += event
-	PStimer.hashes += event.hash
+	timer_controller.processing_timers += event
+	timer_controller.hashes += event.hash
 	return event.id
 
 /proc/deltimer(id)
-	for(var/datum/timedevent/event in PStimer.processing_timers)
+	for(var/datum/timedevent/event in timer_controller.processing_timers)
 		if(event.id == id)
 			qdel(event)
 			return 1

code/game/turfs/unsimulated/floor.dm

@@ -13,4 +13,18 @@
 /turf/unsimulated/floor/snow
 	name = "snow"
 	icon = 'icons/turf/snow.dmi'
-	icon_state = "snow"
+	icon_state = "snow"
+
+/turf/unsimulated/floor/chasm
+	name = "sinkhole"
+	desc = "It's difficult to see the bottom."
+	density = 1
+	icon = 'icons/turf/floors/Chasms.dmi'
+	icon_state = "Fill"
+	smooth = SMOOTH_TRUE
+	canSmoothWith = null
+
+/turf/unsimulated/floor/chasm/New()
+	spawn(1)
+		smooth_icon(src)
+		smooth_icon_neighbors(src)

code/modules/awaymissions/mission_code/beach.dm

@@ -0,0 +1,37 @@
+/obj/effect/waterfall
+	name = "waterfall effect"
+	icon = 'icons/effects/effects.dmi'
+	icon_state = "extinguish"
+	opacity = 0
+	mouse_opacity = 0
+	density = 0
+	anchored = 1
+	invisibility = 101
+
+	var/water_frequency = 15
+	var/water_timer = 0
+
+/obj/effect/waterfall/New()
+	water_timer = addtimer(src, "drip", water_frequency)
+
+/obj/effect/waterfall/Destroy()
+	if(water_timer)
+		deltimer(water_timer)
+	water_timer = null
+
+/obj/effect/waterfall/proc/drip()
+	var/obj/effect/effect/water/W = new(loc)
+	W.dir = dir
+	spawn(1)
+		W.loc = get_step(W, dir)
+	water_timer = addtimer(src, "drip", water_frequency)
+
+/obj/structure/sign/terrain
+	name = "warning sign"
+	desc = "Watch your step! Unstable terrain."
+	density = 1
+	icon = 'icons/obj/stationobjs.dmi'
+	icon_state = "signpost"
+
+/obj/structure/sign/terrain/attack_hand(mob/user)
+	examine(user)