This story appears in the August 2010 issue of National Geographic magazine ... They built up during ice ages, when the sea level dropped dramatically, leaving the caves dry.

The ocean has a 'conveyer belt.' Here's why it's important. An astonishing—and accidental—Ice Age cave discovery An astonishing—and accidental—Ice Age cave discovery Ice Age mammoth’s ...

This story appears in the March 2017 issue of National Geographic magazine ... in mapping new parts of the cave and collecting scientific data. Ice crystals populate Full Moon Hall.

8 min read This story appears in the September 2013 issue of National Geographic magazine. The maps here show the world as it is now, with only one difference: All the ice on land has melted and ...

When Sergio García-Dils de la Vega kissed his girlfriend, Pilar Orche, goodbye at the entrance to Krubera Cave, he promised to return the next day. But after teammate Bernard Tourte bruised his ...

This story appears in the June 2019 issue of National Geographic magazine ... two of the top three largest known caves in the world. To get there, a punishing path and 90 percent humidity test ...