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 ...

Scuba diving is an exhilarating activity but it is not without risks. You can be put in danger by the cold water, extreme depths, underwater debris, currents, animals, or a combination of any of ...

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 ...

Mysterious and dangerous to explore, blue holes are underwater caves, formed as long as 300,000 years ago during the Ice Age. They are liquid time capsules, filled with fossils that offer clues to the ...

Jill Heinerth was wriggling through a narrow crack in the underwater cave when claustrophobia caught hold of her dive partner. The January 2011 dive was her first with Ruth, a twentysomething marine ...

Anchialine Caves and Cave Fauna—Biology of Marine Caves www.tamug.edu/cavebiology See images from underwater expeditions in the Bahamas and learn more about the ...