Ghost, I think you could still do this one. Jules Vern comes to mind, or spelunking, or even a underground caves like in Utah or Brice Canyon where visitors wonder around on tours of the caverns. There are quite a few ways you could implement the human touch and still capture the essence of underground. Heck, even do the city (forget the name.. bad me.) from the Matrix, the last human city. All good ideas.. drats.. now I have to come up with a new one for myself since Ive made these ones public. LOL

The doctor says I have way too much blood in my caffeine system.