With a depth of around 2,199 metres, a cave in Georgia is so deep that nearly seven Eiffel Towers could fit inside.

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.

One such drop is known as Fantastic Pit within Ellison’s Cave. It is the deepest freefall pit in America, plunging down vertically for 179 meters (586 feet). Within the same system is Incredible ...

This cave is so deep that it can accommodate 30 Qutub Minars and more... it is in... Caves have been part of the civilisation from the beginning of the formation of ...

An expedition to the deepest known cave in the world suddenly goes wrong for Dick Willis.

From a protected cove on Long Island, Dean’s Blue Hole—Earth’s deepest known underwater cave—plunges more than 600 feet into darkness. The entry to South Passage is decorated by ...

Deep inside a labyrinthine cave in southwestern France ... dating to the same period as the engravings. It is the only known ...

There is no light deep in the rocky world of caves - but there is an abundance ... Animals that are adapted to live in caves are known as troglofauna. Some - such as bats, bears and swiftlets - use ...