Deep beneath the Balkans, a massive sulfur-fed cave hosts a colony of 111,000 spiders in one shared web, defying typical ...

In the brutal world of deep caves, bacteria live in a miniature world of terror. The weapons they have evolved can defeat ...

UC San Diego bioengineer Kiana Aran spent five days sealed inside a pitch-black chamber in rural Poland last November, tracking her own brain and body as her internal clock fell apart. The ...

1 of 12 — Looking down Puits Garby at caver Adam Spillane. 2 of 12 — Cavers cross Lake Cadoux in a small dingy inside the Gouffre Berger cave. A 4-meter-deep (approximately 13 feet) pool of water ...

Deep inside White River Cave in Georgia, explorers pushed through tunnels covered in graffiti and filled with bats. The passages twisted through dark rooms and narrow ledges where old ropes hung from ...

The cenotes of Mexico are famous not only for their beauty, but for the archaeological finds they reveal.

The Lava River Cave exhaled chilled air. I put on my sweatshirt, despite the hot July day. Though I'd been warned about the sudden drop in temperature to a crisp 42 degrees, it was hard to believe I'd ...