A large gray serpent-like eel with a large lump in its stomach swims through the dark ocean. Ocean explorers recently stumbled upon an extremely unusual sight in the Pacific's deep sea — a rare, ...

Contentedly full from its last meal, a mysterious sea creature swam through the royal blue depths off the coast of Costa Rica. Twirling and spiraling, the misshapen animal moved in a mesmerizing way.

Glowing sea animals use bioluminescence powered by luciferin to communicate, attract prey and defend themselves, turning the ...

These creatures look like they’ve come straight out of a nightmare. Humans have explored much of the land, but the ocean depths remain largely unknown. What we do know, however, is that some of the ...

Scientists saw a mysterious deep sea animal, still misshapen from its last meal, swimming off the coast of Costa Rica, a first-of-its-kind video shows. Screengrab from the Schmidt Ocean Institute's ...