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 ...

The discovery, led by scientists from the Schmidt Ocean Institute in Palo Alto, California, revealed a previously unknown ...

but the underwater sections are simply breathtaking. Located on New Zealand's North Island, these caves are famous for their ...

The underwater caves of the Yucatán Peninsula ... these animals had to venture down dark, dry cave passages to reach drinking water, sometimes surprisingly far away from an entrance.

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 ...

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.

But hearing about what was going on underwater rather than seeing it for herself ... “It’s a very surreal experience,” Beddows says of her visits to the eerily dark, nearly football field–size cave.

A scuba diver has tragically been found dead after vanishing while exploring a notorious underwater maze of caves. Local police were called to the Twin Caves complex, situated at the Blue Springs ...

A group of divers have connected two underwater caverns in eastern Mexico to reveal what is believed to be the biggest flooded cave on the planet, a discovery that could help shed new light on the ...