Actually unlock the vault to access the nuke during Blob critical mass

code/game/gamemodes/blob/blob.dm

@@ -184,6 +184,10 @@ var/list/blob_nodes = list()
 		if (2)
 			command_alert("The biohazard has grown out of control and will soon reach critical mass. Activate the nuclear failsafe to mantain quarantine. The Nuclear Authentication Code is [get_nuke_code()] ", "Biohazard Alert")
 			set_security_level("gamma")
+			var/obj/machinery/door/airlock/vault/V = locate(/obj/machinery/door/airlock/vault) in world
+			if(V && V.z == 1)
+				V.locked = 0
+				V.update_icon()
 			send_intercept(2)
 			spawn(10)	world << sound('sound/effects/siren.ogg')
 			return