Hells Canyon, the deepest river gorge in the United States, likely got rapidly carved 2.1 million years ago when a shifting landscape in Idaho caused a giant lake to start overflowing. That's ...

In southwest Arkansas, the state government runs what might be the world's most unusual diamond mine. For the price of a movie ticket, anyone can dig for diamonds at Crater of Diamonds State Park—and ...

Orpheus, a small AUV built by Orpheus Ocean, has completed six dives to depths of 3.5 miles. The AUV, based in New Bedford, is designed to explore extreme ocean depths and collect data. The company ...

Bottom dwellers have never been more spectacular. In a tiny, high-tech submersible sunk deeper than the height of Mount Everest, scientists have discovered a flourishing ecosystem some 30,000 feet ...