The Hranicka Abyss is at least 1,325 feet deep, and likely goes down further. — -- A team of explorers believe they have discovered the deepest known underwater cavern the world in eastern Czech ...

This summer, Richard Brown and five others from around the country hiked almost 30 miles into the Bob Marshall Wilderness to explore an underground wilderness few have seen. More people have walked on ...

Scientists have discovered the world's largest underground thermal lake in a cave in southern Albania, the results of a new expedition confirm. Researchers from the Czech Republic first found the lake ...

Rescuers from across Europe rushed to a cave in Turkey on Thursday, launching an operation to save an American researcher who became trapped almost 3,000 feet below the cave's entrance after suffering ...

Three cave explorers were rescued after being reported missing after entering a cave in North Yorkshire, England, on Oct. 2, ...

Hidden inside Vietnam’s Phong Nha-Ke Bang National Park is Son Doong, the largest cave on Earth. It’s so vast that a Boeing ...

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 ...

Beneath the surface of an otherwise unassuming National Park, a labyrinth showcases hundreds of millions of years of geologic history. Each shade of tan layered on the walls represents a different era ...