Evidence points to a long-lost ocean beneath Ariel’s icy crust. Tides and orbit shifts may have cracked its surface billions of years ago. Growing evidence indicates that a deep ocean may lie hidden ...

Scientists think one of Uranus' moons may once have had an ocean roughly 100 miles deep — about 40 times deeper than the ...

Hidden nearly 2,300 feet beneath the Atlantic Ocean, scientists have uncovered an ancient and active undersea landscape that ...

The Pacific Ocean is home to some of the deepest points on the planet. In fact, four of the top six deepest spots in the world can be found in the Pacific. The Pacific's basin is uniquely low, which ...

The deepest part of any of the world’s oceans, known as Challenger Deep, is a portion of the Mariana Trench that goes down to ...