Cave diving combines the thrill of scuba diving and with the excitement of exploring a cave; it’s a challenging activity even for experienced explorers. At these four sites — some of the most popular ...

Hidden in the hills of central Portugal is the entrance to Alviela Cave, one of the deepest underwater caves in Europe. Reaching the dive site is an adventure on its own. The team spends hours ...

Two men drowned while on a diving expedition in a mazelike Florida cave system that extends deep below the surface, authorities said Thursday. The Hernando County Sheriff's Office said three teenagers ...

On Sunday’s episode of The Excerpt podcast: Hidden beneath Earth’s surface are caverns and pathways that hold the secrets of our planet’s very beginnings. Even after decades of exploration, there are ...

Add Yahoo as a preferred source to see more of our stories on Google. Beneath the Lukács Thermal Baths in Budapest lies a hidden world: a vast underwater cave system. - Csaba Tokolyi Every day, crowds ...

Correction: A previous version of this article referred to the non-profit organization Karst Underwater Research as "Karst Underground Research" in one instance. This has been corrected. A group of ...

Two men drowned while on a diving expedition in a mazelike Florida cave system that extends deep below the surface, authorities said Thursday. The Hernando County Sheriff’s Office said three teenagers ...