In the absolute darkness 333 feet beneath Tennessee's Cardwell Mountain, I am belly-crawling through a passage barely wider than my shoulders, headlamp cutting through blackness so complete it seems ...

This story is part of a series. View the other stories here. Mountains aren’t just solid stone. Beneath their austere foundation, spaces wind deep into the earth — places people have long explored.

You might not think about caves in the same breath as you do the deep ocean or outer space, but you probably should. There are approximately 70,000 caves in the United States alone, but the vast ...

Matt Ewles says rescue incidents give caving a bad reputation After an arduous 30-hour operation to save three men trapped underground highlighted the potential perils of caving, some may question its ...