In begining concept this mod was prior build to make new areas. Mostly small and medium, interesting and crazy like random encounters. Now i got ideas about making large dungeons. Like in Might&Magic game when you walk on world and sometime found building with deep labirynth. I like this rpg concept and maybe make this in fallout world. Not every underground levels will be vaults. It may be some industrials or.. metro. But this must got some sense. So write here ideas about undergrounds.