tether module

code/modules/mod/mod_types.dm

@@ -158,6 +158,7 @@
 		/obj/item/mod/module/welding,
 		/obj/item/mod/module/rad_protection,
 		/obj/item/mod/module/flashlight,
+		/obj/item/mod/module/tether,
 	)
 
 /obj/item/mod/control/pre_equipped/responsory
@@ -248,6 +249,7 @@
 		/obj/item/mod/module/flashlight,
 		/obj/item/mod/module/bikehorn,
 		/obj/item/mod/module/rad_protection,
+		/obj/item/mod/module/tether,
 	) //one of every type of module, for testing if they all work correctly
 
 /obj/item/mod/control/pre_equipped/administrative

code/modules/mod/modules/modules_engineering.dm

@@ -81,7 +81,64 @@
 	complexity = 0
 	slowdown_active = 0
 
-// No tether module, sorry!
+///Emergency Tether - Shoots a grappling hook projectile in 0g that throws the user towards it.
+/obj/item/mod/module/tether
+	name = "MOD emergency tether module"
+	desc = "A custom-built grappling-hook powered by a winch capable of hauling the user. \
+		While some older models of cargo-oriented grapples have capacities of a few tons, \
+		these are only capable of working in zero-gravity environments, a blessing to some Engineers."
+	icon_state = "tether"
+	module_type = MODULE_ACTIVE
+	complexity = 3
+	use_power_cost = DEFAULT_CHARGE_DRAIN
+	incompatible_modules = list(/obj/item/mod/module/tether)
+	cooldown_time = 1.5 SECONDS
+
+/obj/item/mod/module/tether/on_use()
+	if(mod.wearer.has_gravity(get_turf(src)))
+		balloon_alert(mod.wearer, "too much gravity!")
+		playsound(src, "gun_dry_fire", 25, TRUE)
+		return FALSE
+	return ..()
+
+/obj/item/mod/module/tether/on_select_use(atom/target)
+	. = ..()
+	if(!.)
+		return
+	var/obj/item/projectile/tether = new /obj/item/projectile/tether(mod.wearer.loc)
+	tether.preparePixelProjectile(target, mod.wearer)
+	tether.firer = mod.wearer
+	playsound(src, 'sound/weapons/batonextend.ogg', 25, TRUE)
+	INVOKE_ASYNC(tether, /obj/item/projectile.proc/fire)
+	drain_power(use_power_cost)
+
+/obj/item/projectile/tether
+	name = "tether"
+	icon_state = "tether_projectile"
+	icon = 'icons/obj/clothing/modsuit/mod_modules.dmi'
+	damage = 0
+	nodamage = TRUE
+	range = 10
+	hitsound = 'sound/weapons/batonextend.ogg'
+	hitsound_wall = 'sound/weapons/batonextend.ogg'
+	suppressed = SUPPRESSED_VERY
+	hit_threshhold = LATTICE_LAYER
+	/// Reference to the beam following the projectile.
+	var/line
+
+/obj/item/projectile/tether/fire(setAngle)
+	if(firer)
+		line = firer.Beam(src, "line", 'icons/obj/clothing/modsuit/mod_modules.dmi')
+	..()
+
+/obj/item/projectile/tether/on_hit(atom/target)
+	. = ..()
+	if(firer)
+		firer.throw_at(target, 10, 1, firer, FALSE, FALSE, null, MOVE_FORCE_NORMAL, TRUE)
+
+/obj/item/projectile/tether/Destroy()
+	QDEL_NULL(line)
+	return ..()
 
 ///Radiation Protection - Protects the user from radiation, gives them a geiger counter and rad info in the panel.
 /obj/item/mod/module/rad_protection

code/modules/projectiles/projectile.dm

@@ -69,6 +69,8 @@
 	var/projectile_piercing = NONE
 	/// number of times we've pierced something. Incremented BEFORE bullet_act and on_hit proc!
 	var/pierces = 0
+	/// If objects are below this layer, we pass through them
+	var/hit_threshhold = PROJECTILE_HIT_THRESHHOLD_LAYER
 	/// "leftover" pixels for Range() calculation as pixel_move() was moved to simulated semi-pixel movement and Range() is in tiles.
 	var/pixels_range_leftover = 0
 	/// "leftover" tick pixels and stuff yeah, so we don't round off things and introducing tracing inaccuracy.
@@ -519,7 +521,7 @@
 	if(!isliving(target))
 		if(isturf(target))		// non dense turfs
 			return FALSE
-		if(target.layer < PROJECTILE_HIT_THRESHHOLD_LAYER)
+		if(target.layer < hit_threshhold)
 			return FALSE
 		else if(!direct_target)		// non dense objects do not get hit unless specifically clicked
 			return FALSE

code/modules/research/designs/mod_designs.dm

@@ -241,6 +241,14 @@
 	build_type = PROTOLATHE
 	departmental_flags = DEPARTMENTAL_FLAG_SECURITY
 
+/datum/design/module/mod_tether
+	name = "Emergency Tether Module"
+	id = "mod_tether"
+	materials = list(/datum/material/iron = 1000, /datum/material/silver = 500)
+	build_path = /obj/item/mod/module/tether
+	build_type = PROTOLATHE
+	departmental_flags = DEPARTMENTAL_FLAG_ENGINEERING
+
 /datum/design/module/mod_mouthhole
 	name = "Eating Apparatus Module"
 	id = "mod_mouthhole"

code/modules/research/techweb/nodes/mod_nodes.dm

@@ -44,6 +44,7 @@
 		"mod_visor_meson",
 		"mod_t_ray",
 		"mod_magboot",
+		"mod_tether",
 		"mod_constructor",
 		"mod_mister_atmos",
 	)