Conservationists say retrieving mineral-rich rocks will destroy sea life. Environmental studies show conflicting results.

More than 10,000 feet deep in the ocean, the seafloor is covered with what look like dark, lumpy potatoes. These polymetallic nodules, as they're known, take millions of years to form, slowly ...

China's latest technological innovation can cut subsea cables at a depth of up to 3,500 meters.

Japan’s deepest ocean trenches are full of strange life, from record-setting fish to mysterious animals that still defy ...