diff --git a/maps/tether/submaps/_tether_submaps.dm b/maps/tether/submaps/_tether_submaps.dm
index 17eff1b80a3..453b4dc8c01 100644
--- a/maps/tether/submaps/_tether_submaps.dm
+++ b/maps/tether/submaps/_tether_submaps.dm
@@ -42,7 +42,7 @@
 
 /datum/map_template/tether_lateload/tether_underdark/on_map_loaded(z)
 	. = ..()
-	seed_submaps(list(Z_LEVEL_UNDERDARK), 150, /area/mine/unexplored/underdark, /datum/map_template/underdark)
+	seed_submaps(list(Z_LEVEL_UNDERDARK), 100, /area/mine/unexplored/underdark, /datum/map_template/underdark)
 	new /datum/random_map/automata/cave_system/no_cracks(null, 3, 3, Z_LEVEL_UNDERDARK, world.maxx - 4, world.maxy - 4) // Create the mining Z-level.
 	new /datum/random_map/noise/ore(null, 1, 1, Z_LEVEL_UNDERDARK, 64, 64)         // Create the mining ore distribution map.