One of the world's deepest and most dangerous caves lies in Abkhazia, a disputed part of Georgia. It takes days to get to the ...

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 ...

Sunlight penetrates deep inside, allowing mosses ... shafts—tunnels that slope relatively straightforwardly down—natural caves are nonlinear and ex-pand and contract according to the movement ...

Scientists have found ancient nail tooth shark fossils deep inside Mammoth Cave in Kentucky, revealing new information about ...

But these deep, dark habitats are often challenging for humans to access. Underwater caves can be dangerous for even the most experienced divers. There is usually no natural light, spaces can be ...