Discover Uwe Rath’s journey as a cave diving pioneer, exploring hidden underwater caves in the Dominican Republic.

For centuries, cenotes have held a mystique that captivates adventurers, historians, and spiritual seekers alike. T ...

Scientists are delving deep into the belly of the Earth. Who are these cave explorers, what have they found, and what do they ...

The magazine's most-read articles of the year included a close-up look at the adorable yet venomous pygmy slow loris, a ...

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 ...

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 ...

Three months ago, Xisco Gràcia experienced what he describes as every diver's worst nightmare - he found himself in an underwater cave, relying on an air pocket for survival. As hours turned into ...

(This program is no longer available for streaming.) Follow a fearless team of scientists as they venture into blue holes—underwater caves that formed during the last ice age, when sea level ...

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 ...

But there is hope, says Thymann, and documenting this dense habitat of underwater caves may be the first step in protecting the manatees that live there. Receive a weekly dose of discovery in your ...