International research and highly-specialized divers are bringing an underground, underwater world to the surface ...

Explorers in southern Spain have linked two deep caves into one “supercave system” about 16.4 miles long. The connection sits ...

Archaeologists excavating a paleolithic cave site in Galilee, Israel, have found evidence that a deep-cave compound at the site may have been used for ritualistic gatherings, according to a new paper ...

The Saint-Marcel cave is one of France’s largest and best-researched cave systems. Its caverns and tunnels stretch underground for 64 kilometers. Humans have sheltered there since the Middle ...

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.

What started as a simple walk into a storm pipe turned into one of the biggest river caves the explorers had ever seen. The ...

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 ...

The Lava River Cave outside of Bend is a mile deep and 60 feet tall. Here's how to explore Oregon's longest lava tube.

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 ...

Firefighters encountered an unexpected challenge while rescuing a dog trapped in a Tennessee cave: A black bear was also there. The dog, Charlie, spent three days trapped nearly 40 feet deep in an ...

TASELI PLATEAU, Turkey — Rescuers pulled an American researcher out of a Turkish cave early Tuesday, more than a week after he became seriously ill more than 3,000 feet below its entrance, officials ...