wait I didn't program underground yet, but I added super powers, here I'll add code:
[ATTRIBUTES]
<>UNDERGROUND=TRUE
<>DEPTH=50FT
<>STARTUP_ADD
[COMMAND:EDIT]
<>OUTHOUSES=ADD
<>FEATURES=TRUE
<>ADDFET.=SMELLY
<>STARTUP_ADD
there, feel free to add your own features, lets make our own twilight zone/offtopic/greenland world!