Underground environments are both common work places for some, a place to explore, or a fragile ecosystem that can kill a human. A perfect place to set a story! In this category I include mining, natural cave systems and geysers.
Underground environments are both common work places for some, a place to explore, or a fragile ecosystem that can kill a human. A perfect place to set a story! In this category I include mining, natural cave systems and geysers.