diff --git a/tubelib_addons1/grinder.lua b/tubelib_addons1/grinder.lua
index 466a4a1..2de9eea 100644
--- a/tubelib_addons1/grinder.lua
+++ b/tubelib_addons1/grinder.lua
@@ -337,6 +337,17 @@ else
 	tubelib.add_grinder_recipe({input="default:sand", output="default:clay"})
 end
 
+if minetest.get_modpath("underch") then
+	for regnodename,v in pairs(minetest.registered_nodes) do
+		if string.find(regnodename, "underch:") then
+			if string.find(regnodename, "_cobble") and not string.find(regnodename, "_wall") then
+				print("tubelib.add_grinder_recipe: " .. regnodename)
+				tubelib.add_grinder_recipe({input=regnodename, output="default:gravel"})
+			end
+		end
+	end
+end
+
 tubelib.add_grinder_recipe({input="default:sandstone", output="default:sand 4"})
 tubelib.add_grinder_recipe({input="default:desert_sandstone", output="default:desert_sand 4"})
 tubelib.add_grinder_recipe({input="default:silver_sandstone", output="default:silver_sand 4"})
diff --git a/tubelib_addons1/nodes.lua b/tubelib_addons1/nodes.lua
index c54e402..87c892a 100644
--- a/tubelib_addons1/nodes.lua
+++ b/tubelib_addons1/nodes.lua
@@ -254,6 +254,21 @@ gn("ethereal:illumishroom")
 gn("ethereal:illumishroom2")
 gn("ethereal:illumishroom3")
 
+-------------------------------------------------------------------------------
+-- underch Ground
+-------------------------------------------------------------------------------
+
+if minetest.get_modpath("underch") then
+	for regnodename,v in pairs(minetest.registered_nodes) do
+		if string.find(regnodename, "underch:") then
+			if string.find(regnodename, "_cobble") and not string.find(regnodename, "_wall") then
+				gnname = string.gsub(regnodename, "_cobble", "")
+				print("tubelib_addons1.register_ground_node: " .. gnname)
+				gn(gnname, regnodename)
+			end
+		end
+	end
+end
 
 -------------------------------------------------------------------------------
 -- Registered flowers