diff --git a/code/__DEFINES/tgs.dm b/code/__DEFINES/tgs.dm
index 6187a67825..b0e97e05e9 100644
--- a/code/__DEFINES/tgs.dm
+++ b/code/__DEFINES/tgs.dm
@@ -1,6 +1,6 @@
 // tgstation-server DMAPI
 
-#define TGS_DMAPI_VERSION "6.5.3"
+#define TGS_DMAPI_VERSION "6.7.0"
 
 // All functions and datums outside this document are subject to change with any version and should not be relied on.
 
@@ -129,6 +129,13 @@
 /// DreamDaemon Ultrasafe security level.
 #define TGS_SECURITY_ULTRASAFE 2
 
+/// DreamDaemon public visibility level.
+#define TGS_VISIBILITY_PUBLIC 0
+/// DreamDaemon private visibility level.
+#define TGS_VISIBILITY_PRIVATE 1
+/// DreamDaemon invisible visibility level.
+#define TGS_VISIBILITY_INVISIBLE 2
+
 //REQUIRED HOOKS
 
 /**
@@ -458,6 +465,10 @@
 /world/proc/TgsSecurityLevel()
 	return
 
+/// Returns the current BYOND visibility level as a TGS_VISIBILITY_ define if TGS is present, null otherwise. Requires TGS to be using interop API version 5 or higher otherwise the string "___unimplemented" wil be returned. This function may sleep if the call to [/world/proc/TgsNew] is sleeping!
+/world/proc/TgsVisibility()
+	return
+
 /// Returns a list of active [/datum/tgs_revision_information/test_merge]s if TGS is present, null otherwise. This function may sleep if the call to [/world/proc/TgsNew] is sleeping!
 /world/proc/TgsTestMerges()
 	return
diff --git a/code/modules/tgs/core/core.dm b/code/modules/tgs/core/core.dm
index 41a0473394..b9a9f27a28 100644
--- a/code/modules/tgs/core/core.dm
+++ b/code/modules/tgs/core/core.dm
@@ -153,4 +153,9 @@
 /world/TgsSecurityLevel()
 	var/datum/tgs_api/api = TGS_READ_GLOBAL(tgs)
 	if(api)
-		api.SecurityLevel()
+		return api.SecurityLevel()
+
+/world/TgsVisibility()
+	var/datum/tgs_api/api = TGS_READ_GLOBAL(tgs)
+	if(api)
+		return api.Visibility()
diff --git a/code/modules/tgs/core/datum.dm b/code/modules/tgs/core/datum.dm
index 68b0330fe8..07ce3b6845 100644
--- a/code/modules/tgs/core/datum.dm
+++ b/code/modules/tgs/core/datum.dm
@@ -11,6 +11,15 @@ TGS_DEFINE_AND_SET_GLOBAL(tgs, null)
 	src.event_handler = event_handler
 	src.version = version
 
+/datum/tgs_api/proc/TerminateWorld()
+	while(TRUE)
+		TGS_DEBUG_LOG("About to terminate world. Tick: [world.time], sleep_offline: [world.sleep_offline]")
+		world.sleep_offline = FALSE // https://www.byond.com/forum/post/2894866
+		del(world)
+		world.sleep_offline = FALSE // just in case, this is BYOND after all...
+		sleep(1)
+		TGS_DEBUG_LOG("BYOND DIDN'T TERMINATE THE WORLD!!! TICK IS: [world.time], sleep_offline: [world.sleep_offline]")
+
 /datum/tgs_api/latest
 	parent_type = /datum/tgs_api/v5
 
@@ -57,3 +66,6 @@ TGS_PROTECT_DATUM(/datum/tgs_api)
 
 /datum/tgs_api/proc/SecurityLevel()
 	return TGS_UNIMPLEMENTED
+
+/datum/tgs_api/proc/Visibility()
+	return TGS_UNIMPLEMENTED
diff --git a/code/modules/tgs/v4/api.dm b/code/modules/tgs/v4/api.dm
index b9a75c4abb..945e2e4117 100644
--- a/code/modules/tgs/v4/api.dm
+++ b/code/modules/tgs/v4/api.dm
@@ -73,7 +73,7 @@
 	if(cached_json["apiValidateOnly"])
 		TGS_INFO_LOG("Validating API and exiting...")
 		Export(TGS4_COMM_VALIDATE, list(TGS4_PARAMETER_DATA = "[minimum_required_security_level]"))
-		del(world)
+		TerminateWorld()
 
 	security_level = cached_json["securityLevel"]
 	chat_channels_json_path = cached_json["chatChannelsJson"]
@@ -188,7 +188,7 @@
 		requesting_new_port = TRUE
 		if(!world.OpenPort(0)) //open any port
 			TGS_ERROR_LOG("Unable to open random port to retrieve new port![TGS4_PORT_CRITFAIL_MESSAGE]")
-			del(world)
+			TerminateWorld()
 
 		//request a new port
 		export_lock = FALSE
@@ -196,16 +196,16 @@
 
 		if(!new_port_json)
 			TGS_ERROR_LOG("No new port response from server![TGS4_PORT_CRITFAIL_MESSAGE]")
-			del(world)
+			TerminateWorld()
 
 		var/new_port = new_port_json[TGS4_PARAMETER_DATA]
 		if(!isnum(new_port) || new_port <= 0)
 			TGS_ERROR_LOG("Malformed new port json ([json_encode(new_port_json)])![TGS4_PORT_CRITFAIL_MESSAGE]")
-			del(world)
+			TerminateWorld()
 
 		if(new_port != world.port && !world.OpenPort(new_port))
 			TGS_ERROR_LOG("Unable to open port [new_port]![TGS4_PORT_CRITFAIL_MESSAGE]")
-			del(world)
+			TerminateWorld()
 		requesting_new_port = FALSE
 
 	while(export_lock)
diff --git a/code/modules/tgs/v5/__interop_version.dm b/code/modules/tgs/v5/__interop_version.dm
index 5d3d491a73..83420d130a 100644
--- a/code/modules/tgs/v5/__interop_version.dm
+++ b/code/modules/tgs/v5/__interop_version.dm
@@ -1 +1 @@
-"5.6.1"
+"5.7.0"
diff --git a/code/modules/tgs/v5/_defines.dm b/code/modules/tgs/v5/_defines.dm
index f973338daa..48969c0c7d 100644
--- a/code/modules/tgs/v5/_defines.dm
+++ b/code/modules/tgs/v5/_defines.dm
@@ -48,6 +48,7 @@
 #define DMAPI5_RUNTIME_INFORMATION_REVISION "revision"
 #define DMAPI5_RUNTIME_INFORMATION_TEST_MERGES "testMerges"
 #define DMAPI5_RUNTIME_INFORMATION_SECURITY_LEVEL "securityLevel"
+#define DMAPI5_RUNTIME_INFORMATION_VISIBILITY "visibility"
 
 #define DMAPI5_CHAT_UPDATE_CHANNELS "channels"
 
@@ -79,6 +80,7 @@
 #define DMAPI5_TOPIC_COMMAND_WATCHDOG_REATTACH 8
 #define DMAPI5_TOPIC_COMMAND_SEND_CHUNK 9
 #define DMAPI5_TOPIC_COMMAND_RECEIVE_CHUNK 10
+#define DMAPI5_TOPIC_COMMAND_RECEIVE_BROADCAST 11
 
 #define DMAPI5_TOPIC_PARAMETER_COMMAND_TYPE "commandType"
 #define DMAPI5_TOPIC_PARAMETER_CHAT_COMMAND "chatCommand"
@@ -88,6 +90,7 @@
 #define DMAPI5_TOPIC_PARAMETER_NEW_INSTANCE_NAME "newInstanceName"
 #define DMAPI5_TOPIC_PARAMETER_CHAT_UPDATE "chatUpdate"
 #define DMAPI5_TOPIC_PARAMETER_NEW_SERVER_VERSION "newServerVersion"
+#define DMAPI5_TOPIC_PARAMETER_BROADCAST_MESSAGE "broadcastMessage"
 
 #define DMAPI5_TOPIC_RESPONSE_COMMAND_RESPONSE "commandResponse"
 #define DMAPI5_TOPIC_RESPONSE_COMMAND_RESPONSE_MESSAGE "commandResponseMessage"
diff --git a/code/modules/tgs/v5/api.dm b/code/modules/tgs/v5/api.dm
index 34cc43f876..7226f29bba 100644
--- a/code/modules/tgs/v5/api.dm
+++ b/code/modules/tgs/v5/api.dm
@@ -4,6 +4,7 @@
 
 	var/instance_name
 	var/security_level
+	var/visibility
 
 	var/reboot_mode = TGS_REBOOT_MODE_NORMAL
 
@@ -50,10 +51,11 @@
 
 	if(runtime_information[DMAPI5_RUNTIME_INFORMATION_API_VALIDATE_ONLY])
 		TGS_INFO_LOG("DMAPI validation, exiting...")
-		del(world)
+		TerminateWorld()
 
 	version = new /datum/tgs_version(runtime_information[DMAPI5_RUNTIME_INFORMATION_SERVER_VERSION])
 	security_level = runtime_information[DMAPI5_RUNTIME_INFORMATION_SECURITY_LEVEL]
+	visibility = runtime_information[DMAPI5_RUNTIME_INFORMATION_VISIBILITY]
 	instance_name = runtime_information[DMAPI5_RUNTIME_INFORMATION_INSTANCE_NAME]
 
 	var/list/revisionData = runtime_information[DMAPI5_RUNTIME_INFORMATION_REVISION]
@@ -252,3 +254,7 @@
 /datum/tgs_api/v5/SecurityLevel()
 	RequireInitialBridgeResponse()
 	return security_level
+
+/datum/tgs_api/v5/Visibility()
+	RequireInitialBridgeResponse()
+	return visibility
diff --git a/code/modules/tgs/v5/topic.dm b/code/modules/tgs/v5/topic.dm
index d7d4712138..2ef0c70a97 100644
--- a/code/modules/tgs/v5/topic.dm
+++ b/code/modules/tgs/v5/topic.dm
@@ -94,7 +94,7 @@
 		if(DMAPI5_TOPIC_COMMAND_CHANGE_PORT)
 			var/new_port = topic_parameters[DMAPI5_TOPIC_PARAMETER_NEW_PORT]
 			if (!isnum(new_port) || !(new_port > 0))
-				return TopicResponse("Invalid or missing [DMAPI5_TOPIC_PARAMETER_NEW_PORT]]")
+				return TopicResponse("Invalid or missing [DMAPI5_TOPIC_PARAMETER_NEW_PORT]")
 
 			if(event_handler != null)
 				event_handler.HandleEvent(TGS_EVENT_PORT_SWAP, new_port)
@@ -141,7 +141,7 @@
 		if(DMAPI5_TOPIC_COMMAND_SERVER_PORT_UPDATE)
 			var/new_port = topic_parameters[DMAPI5_TOPIC_PARAMETER_NEW_PORT]
 			if (!isnum(new_port) || !(new_port > 0))
-				return TopicResponse("Invalid or missing [DMAPI5_TOPIC_PARAMETER_NEW_PORT]]")
+				return TopicResponse("Invalid or missing [DMAPI5_TOPIC_PARAMETER_NEW_PORT]")
 
 			server_port = new_port
 			return TopicResponse()
@@ -157,7 +157,7 @@
 			var/error_message = null
 			if (new_port != null)
 				if (!isnum(new_port) || !(new_port > 0))
-					error_message = "Invalid [DMAPI5_TOPIC_PARAMETER_NEW_PORT]]"
+					error_message = "Invalid [DMAPI5_TOPIC_PARAMETER_NEW_PORT]"
 				else
 					server_port = new_port
 
@@ -165,7 +165,7 @@
 			if (!istext(new_version_string))
 				if(error_message != null)
 					error_message += ", "
-				error_message += "Invalid or missing [DMAPI5_TOPIC_PARAMETER_NEW_SERVER_VERSION]]"
+				error_message += "Invalid or missing [DMAPI5_TOPIC_PARAMETER_NEW_SERVER_VERSION]"
 			else
 				var/datum/tgs_version/new_version = new(new_version_string)
 				if (event_handler)
@@ -267,4 +267,16 @@
 
 			return chunk_to_send
 
+		if(DMAPI5_TOPIC_COMMAND_RECEIVE_BROADCAST)
+			var/message = topic_parameters[DMAPI5_TOPIC_PARAMETER_BROADCAST_MESSAGE]
+			if (!istext(message))
+				return TopicResponse("Invalid or missing [DMAPI5_TOPIC_PARAMETER_BROADCAST_MESSAGE]")
+
+			TGS_WORLD_ANNOUNCE(message)
+			return TopicResponse()
+
 	return TopicResponse("Unknown command: [command]")
+
+/datum/tgs_api/v5/proc/WorldBroadcast(message)
+	set waitfor = FALSE
+	TGS_WORLD_ANNOUNCE(message)
diff --git a/code/modules/tgs/v5/undefs.dm b/code/modules/tgs/v5/undefs.dm
index c679737dfc..fd1ed7e4cf 100644
--- a/code/modules/tgs/v5/undefs.dm
+++ b/code/modules/tgs/v5/undefs.dm
@@ -48,6 +48,7 @@
 #undef DMAPI5_RUNTIME_INFORMATION_REVISION
 #undef DMAPI5_RUNTIME_INFORMATION_TEST_MERGES
 #undef DMAPI5_RUNTIME_INFORMATION_SECURITY_LEVEL
+#undef DMAPI5_RUNTIME_INFORMATION_VISIBILITY
 
 #undef DMAPI5_CHAT_UPDATE_CHANNELS
 
@@ -77,6 +78,9 @@
 #undef DMAPI5_TOPIC_COMMAND_SERVER_PORT_UPDATE
 #undef DMAPI5_TOPIC_COMMAND_HEALTHCHECK
 #undef DMAPI5_TOPIC_COMMAND_WATCHDOG_REATTACH
+#undef DMAPI5_TOPIC_COMMAND_SEND_CHUNK
+#undef DMAPI5_TOPIC_COMMAND_RECEIVE_CHUNK
+#undef DMAPI5_TOPIC_COMMAND_RECEIVE_BROADCAST
 
 #undef DMAPI5_TOPIC_PARAMETER_COMMAND_TYPE
 #undef DMAPI5_TOPIC_PARAMETER_CHAT_COMMAND
@@ -86,6 +90,7 @@
 #undef DMAPI5_TOPIC_PARAMETER_NEW_INSTANCE_NAME
 #undef DMAPI5_TOPIC_PARAMETER_CHAT_UPDATE
 #undef DMAPI5_TOPIC_PARAMETER_NEW_SERVER_VERSION
+#undef DMAPI5_TOPIC_PARAMETER_BROADCAST_MESSAGE
 
 #undef DMAPI5_TOPIC_RESPONSE_COMMAND_RESPONSE
 #undef DMAPI5_TOPIC_RESPONSE_COMMAND_RESPONSE_MESSAGE