What some may not know, however, is that it is also home to a deep dark secret ... a secret cave that is. Stretching ...

Krubera Cave in the republic of Georgia is currently the deepest known cave, at 7,208 feet. But Dark Star, with so many areas still to survey, is a prime candidate to take over the title.

Our world is riddled with fascinating, perilous, but beautiful holes into the quiet depths of the crust. To explore a cave is to meet ... somehow navigating the dark, dangerous passage, and ...