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 ...

but the underwater sections are simply breathtaking. Located on New Zealand's North Island, these caves are famous for their glowworms that light up the dark tunnels like stars in the night sky.

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 ...

Beneath the land surface of the Bahamas, the underwater caves known as blue holes stretch for hundreds of miles in all directions. Today, these labyrinthine passages host a variety of tiny sea ...

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 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 ...

There are caves all over the planet, but only a few have been explored. These dark spaces are sheltered from the weather and provide a steady temperature, making them ideal homes for an enormous ...