More than one-fifth of the global ocean—an area spanning more than 75 million sq km—has been the subject of ocean darkening ...

High-definition pictures of a World War I-era U.S. Navy submarine that sank to the bottom of the ocean near San Diego were just released, over a century after it was lost at sea.

Massive seafloor craters off California are shaped by ancient underwater sediment flows—not methane—revealing a hidden ...

I have dived deep under the ice in Antarctica, in water that was below freezing, but I felt much colder here in my home sea, where even at depth the temperature was a steady 57 degrees Fahrenheit.