We know next to nothing about 99.999 percent of the seafloor. How one researcher plans to democratize deep-sea exploration.

The Gonatus antarcticus squid, a mysterious squid found only in the frigid waters around Antarctica, was caught on camera on Christmas Day for the first time.

The colors and light of the deep sea are on full display in these photos from The Radiant Sea: Color and Light in the Underwater World. In this dark realm, coral, shrimp, sharks, jellyfish squid, ...

A secret mission. A restless night. A discovery that changed deep-sea exploration — 40 years later, Titanic's story still resonates.

Australia should back a global moratorium on deep-sea mining as the risks are too high, argue marine ecology experts.