Why it's incredible: The cave is so deep, the world's tallest building could fit inside it. The Hranice Abyss — or "Hranická propast," in Czech — is the deepest known freshwater cave in the world.

Brett Hemphill, a noted diver, died while exploring Phantom Springs Cave in Texas, officials say. Screengrab from Facebook post by Karst Underwater Research. A renowned diver recently died while ...

Bushman’s Hole is a cave in the South African Kalahari that, on the surface, might look modest. What makes it remarkable, especially to experienced cave divers, is its status as one of the world's ...

Beneath 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 staggering ...

On Sunday’s episode of The Excerpt podcast: Hidden beneath Earth’s surface are caverns and pathways that hold the secrets of our planet’s very beginnings. Even after decades of exploration, there are ...

He was involved in one of the most famous rescue missions the world has ever seen. Now, almost seven years on, Jim Warny — who formed part of the team that saved the lives of 12 boys and their ...

"What am I looking for in this cave? I never felt like I fitted in, but the moment I put my head underwater it was like a refuge for me." Dogwoof & Madman Films has revealed the official trailer for a ...

Mexico's Taam Ja' Blue Hole is the deepest known underwater sinkhole in the world, researchers have discovered — and they haven't even reached the bottom yet. New measurements indicate the Taam Ja' ...

Scientists first described the flooded cave in 2016 but determined its extraordinary extent years later. When you purchase through links on our site, we may earn an affiliate commission. Here’s how it ...