If one thing’s clear from Jill Heinerth’s breathtaking new memoir on her life as a professional cave diver, it’s that this unusual career path requires serious mettle. Self portrait under the tannic ...

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 ...

"Please allow us some time to come to terms with his loss, as up until now we have been focused on the recovery,” his co-diver, Andy Pitkin, wrote in a statement Kimberlee Speakman is a digital writer ...

(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 ...