The longest known underwater cave in the world is even longer than we thought. As of the start of this year, cave divers have ...

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

The discovery of more than 100 prehistoric structures in the Cova Dones cave in Spain makes it one of the most significant prehistoric underground sites in the world. Archaeologists found stalagmites ...

(Image credit: Art by Benji Paysnoe) Researchers have discovered the remains of an ancient shark deep inside the world's longest cave system. The newly discovered shark, plucked from the walls of ...

Email notifications are only sent once a day, and only if there are new matching items. With flashlights in hand, sisters MariaElena and Penelope Donahue entered the opening of a mountain cave in ...