In the ocean's twilight zone, where the reach of the Sun fades to nothing, an epic migration begins every time night falls.

The deepest regions of Earth's oceans, known as the abyssal and hadal zones, lie at least as far under the water's surface as Mount Rainier's peak rises above the land surface. These great depths of 4 ...

These spheres from the abyss conceal creatures with startling biology.

Challenger Deep sits at the bottom of the western Pacific’s Mariana Trench, roughly 10,935 meters below the ocean surface. That is nearly seven miles of water pressing down on anything that dares to ...

Dive into the hidden world of the sperm whale, the largest toothed predator on Earth, and discover how it survives crushing ...

Scientists recently discovered more than 50 suspected new species lurking far beneath the waves along a ridge in the middle of the Pacific Ocean. The closest landmass is the remote island of Rapa Nui, ...

The explosion of animal life in Earth's oceans half a billion years ago during and after the Cambrian Period is commonly attributed to a substantial and sustained rise of free oxygen (O 2) in seawater ...