Two decades later, I organized a series of expeditions to investigate new deep caves, using dye traces in cave streams to probe Arabika’s potential depth. In 2001 a team led by Ukrainian Yuri ...

The Hranice Abyss — or "Hranická propast," in Czech — is the deepest known freshwater cave in the world. Geologists think it ...

More is known about the terrain of Mars than about what lies hidden beneath the Earth’s surface. Krubera Cave in the republic of Georgia is currently the deepest known cave, at 7,208 feet.

Ciara Smart is used to leaving people in disbelief when she tells them what she does in her spare time. "They're really not places any sane person would go," she said. Ms Smart is a cave explorer.

There is no light deep in the rocky world of caves - but there is an abundance of animals specially ... making them ideal homes for an enormous diversity of life. Animals that are adapted to live in ...

The Burj Khalifa would go 2,722 feet below the surface. The deepest known point in a cave is in Krubera Cave in Georgia. Switzerland's Gotthard Base Tunnel is the deepest railway tunnel.

Lechuguilla Cave at Carlsbad Caverns is the deepest limestone cave in the country, and the fifth-longest known cave in the world. Read more about Oil and Gas Development Delayed Near Carlsbad Caverns ...

The Burj Khalifa would go 2,722 ft below the surface. The deepest known point in a cave is in Krubera Cave in Georgia. Switzerland's Gotthard Base Tunnel is the deepest railway tunnel. Mponeng in ...