Sign up for free

Newsletters

Once a month
get new photos
and expert tips.

Science and Space
Main Health and Human Body Earth Space Prehistoric World A-Z

Krubera Cave

The Big Cascade, the largest pit in Krubera Cave, plunges 499 feet (152 meters), but spans less than a tenth of the distance to the cave's unknown bottom. Descending into Krubera, in the country of Georgia, one team member said, "was like climbing an inverted Mount Everest."

Photograph by Bernard Tourte