Some of the world’s most fascinating creatures live underwater. And unlike the more mainstream animals under the sea — ...

An iridescent blanket octopus shows off its rainbow-colored cape in a rare new video that will leave you awe-struck.

Imagine diving into a crystal-clear ocean and suddenly coming face-to-face with a bustling metropolis built not by humans, ...

The world's only population of wild Devils Hole pupfish shrank to 38 members after two earthquakes greatly affected the ...

the underwater caves known as blue holes stretch for hundreds of miles in all directions. Today, these labyrinthine passages host a variety of tiny sea creatures found nowhere else on the planet.

Seagrass is crucial to the health of our ocean and provides food and shelter for a ton of animals. But this leafy green ...