Melinda
It's some sort of post-apocalyptic setting. Apparently, there was radiation on this land once and they sent out a bunch of people from BSG-style spaceships down here to test it out. We are waaaaay into the future.
And all our housing facilities are underground for, probably, the radiation thing. Some people pop up here and there, some of our world, some not, but most of those that are not.. get this... are fictional. I mean, seriously. Han Solo is here. I had drinks with him.