The geology teacher spent most weekends exploring and mapping the island's complex system of underwater caves. "Mallorca is ... climb down to get water in the dark. "I decided to swim across ...

From a protected cove on Long Island, Dean’s Blue Hole—Earth’s deepest known underwater cave—plunges more than ... of the inland blue holes—deep, dark, sheltered, with little tidal ...

Take a deep breath and dive below the surface with cave-diving experts and scientists in the video above. Find out what it takes to plunge into the dark and mysterious world of underwater caves. Caves ...

The underwater caves of the Yucatán Peninsula ... these animals had to venture down dark, dry cave passages to reach drinking ...

Krubera Cave in the republic of Georgia is currently the deepest known cave, at 7,208 feet. But Dark Star, with so many areas still to survey, is a prime candidate to take over the title.