Cave diving combines the thrill of scuba diving and with the excitement of exploring a cave; it’s a challenging activity even for experienced explorers. At these four sites — some of the most popular ...

Kenny Broad knows you don't have to leave the planet to explore other worlds. Named National Geographic's 2011 Explorer of the Year and a National Geographic Emerging Explorer, he focuses on cave ...

It’s the stuff of nightmares. The 12 young Thai soccer players miraculously found alive inside a flooded cave are so emaciated that they can barely walk and don’t know how to swim — but now have just ...

Cave diving is perhaps the most dangerous type of exploration that humans have yet to pursue. Even more dangerous than exiting our own atmosphere and entering into space, is the exploration into inner ...

When his phone rang, Ben Reymenants, 45, was packing his dive gear. Reymenants is one of the most sought-after tech diving instructors in Southeast Asia. He’s in the water 300 days a year and has ...

(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 was ...