Deep in the ocean, a giant fish does something no one expects—it produces milk to feed its young. This behavior is almost unheard of in fish, blurring the line between species and survival strategies.

An elusive deep-sea squid species was caught on camera for the first time ever in a major breakthrough. National Geographic, on June 10, revealed the "history-making sighting" of a massive, three-foot ...

Millions tuned into a livestream of rare deep-sea creatures off the coast of Argentina. This viral scientific mission even included a plump starfish resembling a beloved cartoon character.

Scientists discovered 24 new deep-sea species, including one from a completely new branch of life in the Pacific Ocean.

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.