This introduces Gremlins.

code/datums/elements/ventcrawling.dm

@@ -0,0 +1,36 @@
+/datum/element/ventcrawling
+	element_flags = ELEMENT_BESPOKE|ELEMENT_DETACH
+	id_arg_index = 2
+	var/tier
+
+/datum/element/ventcrawling/Attach(datum/target, duration = 0, given_tier = VENTCRAWLER_NUDE)
+	. = ..()
+
+	var/mob/living/person = target
+	if(!istype(person))
+		return FALSE
+
+	src.tier = given_tier
+
+	RegisterSignal(target, COMSIG_HANDLE_VENTCRAWL, .proc/handle_ventcrawl)
+	RegisterSignal(target, COMSIG_CHECK_VENTCRAWL, .proc/check_ventcrawl)
+	to_chat(target, "<span class='notice'>You can ventcrawl! Use alt+click on vents to quickly travel about the station.</span>")
+
+	if(duration!=0)
+		addtimer(CALLBACK(src, .proc/Detach, target), duration)
+
+/datum/element/ventcrawling/Detach(datum/target)
+	UnregisterSignal(target, list(COMSIG_HANDLE_VENTCRAWL, COMSIG_CHECK_VENTCRAWL))
+	to_chat(target, "<span class='notice'>You can no longer ventcrawl.</span>")
+
+	return ..()
+
+/datum/element/ventcrawling/proc/handle_ventcrawl(datum/target,atom/A)
+	var/mob/living/person = target
+	if(!istype(person))
+		return FALSE
+
+	person.handle_ventcrawl(A,tier)
+
+/datum/element/ventcrawling/proc/check_ventcrawl()
+	return tier