They can be a life-threatening disaster—or a pricey nuisance. Here’s what you need to know about the depressions and holes ...

The world's deepest underwater sinkhole in the waters of Chetumal Bay between Mexico and Belize remains shrouded in mystery after researchers reported they have yet to determine its full depth.

A vast chasm in southern China has opened a window into a world that feels untouched by modern life, revealing a deep, hidden forest sealed off for millennia. When cavers descended into the 630-foot ...

As Harmon Maher walked along the Keystone Trail in central Omaha one morning in February, he spotted something odd: The creek next to the path, normally a gray-green color, ran bright orange. It was ...