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

Europe is home to many beautiful landscapes. One of them in the east of the continent has been described as its Grand Canyon.

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 ...

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.

A US citizen trapped in Turkey's third deepest cave for more than a week has been pulled to safety, rescuers say. More than 150 people were involved in efforts to save caver Mark Dickey after he ...