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

Opalescent baby squid have "midwives" to bring them into the world. Squid eggs wait in gelatinous orbs to hatch. Capitella ...

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 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.