jesus christ get me out of saycode

code/modules/mapping/space_management/multiz_helpers.dm

@@ -11,13 +11,13 @@
 	. = list(center_z)
 	var/other_z = center_z
 	var/offset
-	while((offset = SSmapping.multiz_levels[other_z]["[DOWN]"]))
+	while((offset = SSmapping.multiz_levels[other_z][Z_LEVEL_DOWN]))
 		other_z -= offset
 		if(other_z in .)
 			break	// no infinite loops
 		. += other_z
 	other_z = center_z
-	while((offset = SSmapping.multiz_levels[other_z]["[UP]"]))
+	while((offset = SSmapping.multiz_levels[other_z][Z_LEVEL_UP]))
 		other_z += offset
 		if(other_z in .)
 			break	// no infinite loops

code/modules/mob/living/say.dm

@@ -284,12 +284,20 @@ GLOBAL_LIST_INIT(department_radio_keys, list(
 	var/static/list/eavesdropping_modes = list(MODE_WHISPER = TRUE, MODE_WHISPER_CRIT = TRUE)
 	var/eavesdrop_range = 0
 	var/Zs_too = FALSE
+	var/listener_has_ceiling	= TRUE
+	var/speaker_has_ceiling		= TRUE
+
+	var/turf/speaker_turf = get_turf(src)
+	var/ceiling_turf = GET_TURF_ABOVE(speaker_turf)
+	if(ceiling_turf)
+		if(istransparentturf(ceiling_turf))
+			speaker_has_ceiling = FALSE
 	if(eavesdropping_modes[message_mode])
 		eavesdrop_range = EAVESDROP_EXTRA_RANGE
 	if(message_mode != MODE_WHISPER)
+		Zs_too = TRUE
 		if(say_test(message) == "2")	//CIT CHANGE - ditto
 			message_range += 10
-			Zs_too = TRUE
 	// AZURE EDIT: thaumaturgical loudness (from orisons)
 	if (has_status_effect(/datum/status_effect/thaumaturgy))
 		spans |= SPAN_REALLYBIG
@@ -345,9 +353,21 @@ GLOBAL_LIST_INIT(department_radio_keys, list(
 	var/rendered = compose_message(src, message_language, message, , spans, message_mode)
 	for(var/_AM in listening)
 		var/atom/movable/AM = _AM
+		var/turf/listener_turf = get_turf(_AM)
+		var/listener_ceiling = GET_TURF_ABOVE(listener_turf)
+		if(listener_ceiling)
+			if(istransparentturf(listener_ceiling))
+				listener_has_ceiling = FALSE
 		if(!Zs_too && !isobserver(AM))
 			if(AM.z != src.z)
 				continue
+		if(Zs_too)
+			if(AM.z < src.z && listener_has_ceiling)	//Listener is below the speaker and has a ceiling above them
+				continue
+			if(AM.z > src.z && speaker_has_ceiling)		//Listener is above the speaker and the speaker has a ceiling above
+				continue
+			if(listener_has_ceiling && speaker_has_ceiling && AM.z != src.z)	//Both have a ceiling, on different z-levels -- no hearing at all
+				continue
 		if(eavesdrop_range && get_dist(source, AM) > message_range && !(the_dead[AM]))
 			AM.Hear(eavesrendered, src, message_language, eavesdropping, , spans, message_mode, original_message)
 		else