I'm a severe claustrophobe. After getting trapped in a slide in my local McDonald's at five years old, I swore off all tight and dark spaces forever. So it's not entirely surprising that I couldn't ...

Chinese astronauts, known as taikonauts, were sent into a large limestone cave system in a remote area of China.

On this episode, we hear how a team of researchers at the University of Northern Iowa is exploring the deepest caves in the U.S. with NASA funding. This could inform the search for life on other ...

We went deeper than ever before. In this video, we push the outer limits of Pettyjohns Cave, navigating tight crawls, massive chambers, and eerie silence that only gets more intense the farther you go ...

Hells Canyon, the deepest river gorge in the United States, likely got rapidly carved 2.1 million years ago when a shifting landscape in Idaho caused a giant lake to start overflowing. That's ...