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

A deep-sea expedition off the coast of Brazil has turned up dozens of previously unknown species, including a glowing ...

Six animals pulled from the deep ocean were so biologically distinct that researchers had to create entirely new taxonomic ...

Deep below the surface of the ocean, bacteria and critters that feed off nutrients spouting from hydrothermal vents met with a sudden wave of volcanic sediment, leaving them suffocated. Four months ...

Glittery sea worms and sea squirts fit for "The Lord of the Rings" universe might sound like pure fantasy, but they're very real creatures living in the deep sea. Some of these otherworldly ocean ...

These three fish are freaks, phantoms and mysteries of the deep. Here’s what we’ve learned from the rare glimpses we’ve had of their lives. The deep sea is one of Earth’s final frontiers. Given its ...

A group of “rarely seen” Gervais’ beaked whales was recently spotted near Madeira, a Portuguese archipelago, photos show. Screengrab from the Magic Dolphin ecotour agency A mysterious group of ...

It goes without saying that the world's oceans are vast and mysterious. Therefore, it is no surprise that people have found some truly strange things when exploring them. From ancient statues to war ...

The bottom of the ocean has barely been explored, but every journey to the deep reveals wondrous new lifeforms. As underwater mining gains momentum, we risk destroying one of the Earth’s last great wi ...

Thousands of meters below the ocean's surface lurk some gigantic creatures, much larger than their shallow-water brethren. Scientists have a few hunches for why this happens, but the debate continues.