B eneath the Earth’s surface lies a world so extreme and isolated that it seems more like an alien planet than part of our own. Veryovkina Cave, the deepest known cave on Earth, plunges a ...

I’m accustomed to moving across dangerous terrain, but down here printed maps are often ... Krubera Cave in the republic of Georgia is currently the deepest known cave, at 7,208 feet.

BEST OF 2019: The Veryovkina Cave is the deepest known cave on Earth. It took half a century and about 30 expeditions for Russian cave explorers to reach its record depth of 2,212 metres.