This story appears in the August 2010 issue of National Geographic magazine. We sink into Stargate, sweeping the void with our dive lights. Fifty feet from the surface looms a pale haze, less ...

People are mocking the activity of cave diving online, painting it as an absurd, anti-instinctual hobby that nobody should ...

Our goal was to map one of the world’s unique ecosystems: underwater caves, aka “blue holes.” Their biogeochemistry creates hot spots for extremophile life-forms. They also contain fossils ...

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 ...

Captain Henqua's Spoils is a treasure map found in Dawnshore, the first area of Avowed. This treasure map can be found on top ...

One of the most famous underwater caves in the world, the Blue Hole is a giant sinkhole located off the coast of Belize. The deep blue water, surrounded by coral reefs, creates a striking contrast ...

Discover the mysterious depths of Jacobs Well Natural Area in Texas, a chilling swimming spot with a spooky reputation. Dive ...

This spring the group published a report in the journal Science on its findings at a massive underwater cave on Mexico’s Yucatán Peninsula known as Hoyo Negro, or “black hole.” Beddows’ study of ...

A South Australian sinkhole, known as the Shaft, was popular with extreme divers until four died underneath the ground due to ...

this blue channel contains underwater tunnels, caverns and rock formations. You'll likely spot marine life lining the coral wall at the surface of the hole. As you descend about 410 feet below sea ...