diff --git a/biomes/lava_sea.lua b/biomes/lava_sea.lua
index 0c23ca5..c95bee1 100644
--- a/biomes/lava_sea.lua
+++ b/biomes/lava_sea.lua
@@ -13,13 +13,26 @@ local c_cavern_fungi = minetest.get_content_id("dfcaverns:cavern_fungi") -- para
 
 -------------------------------------------------------------------------------------------
 
-minetest.register_biome({
+local lava_sea_biome_def = {
 	name = "dfcaverns_lava_sea",
 	y_min = dfcaverns.config.lava_sea_min,
 	y_max = dfcaverns.config.level3_min,
 	heat_point = 50,
 	humidity_point = 50,
-})
+}
+
+if not dfcaverns.config.bottom_sea_contains_lava then
+	lava_sea_biome_def._subterrane_mitigate_lava = true
+end
+
+minetest.register_biome(lava_sea_biome_def)
+
+local c_sea
+if dfcaverns.config.bottom_sea_contains_lava then
+	c_sea = c_lava
+else
+	c_sea = c_water
+end
 
 local airspace = 256
 
@@ -45,12 +58,11 @@ minetest.register_on_generated(function(minp, maxp, seed)
 	vm:get_data(data)
 		
 	for z = z_min, z_max do -- for each xy plane progressing northwards
-		--structure loop, hollows out the cavern
 		for y = y_min, y_max do -- for each x row progressing upwards
 			local vi = area:index(x_min, y, z) --current node index
 			for x = x_min, x_max do -- for each node do
 				if data[vi] == c_air or data[vi] == c_water then
-					data[vi] = c_lava
+					data[vi] = c_sea
 				end
 				vi = vi + 1
 			end
diff --git a/config.lua b/config.lua
index 9c1109a..31d3483 100644
--- a/config.lua
+++ b/config.lua
@@ -68,4 +68,6 @@ setting("int", "level1_min", -900, "Upper limit of level 2")
 setting("int", "level2_min", -1500, "Upper limit of level 3")
 setting("int", "level3_min", -2100, "Upper limit of lava sea")
 setting("int", "lava_sea_min", -2700, "Lower limit of the lava sea")
+
 setting("float", "lava_sea_threshold", 0.2, "Cavern threshold for magma sea (higher number means sparser magma)")
+setting("bool", "bottom_sea_contains_lava", true, "Lower sea contains lava")
diff --git a/settingtypes.txt b/settingtypes.txt
index a67aa17..2e8ca3f 100644
--- a/settingtypes.txt
+++ b/settingtypes.txt
@@ -36,5 +36,8 @@ dfcaverns_level2_min (Upper limit of level 3) int -1500
 dfcaverns_level3_min (Upper limit of lava sea) int -2100
 dfcaverns_lava_sea_min (Lower limit of lava sea) int -2700
 
+[Lower Sea]
 #Determines threshold for higher number means sparser magma
-dfcaverns_lava_sea_threshold (Cavern threshold for magma sea) float 0.2 0.0 1.0
\ No newline at end of file
+dfcaverns_lava_sea_threshold (Cavern threshold for magma sea) float 0.2 0.0 1.0
+#When true, the magma sea contains magma. When false, it's water instead.
+dfcaverns_bottom_sea_contains_lava (Lower sea is lava) bool true
\ No newline at end of file