When hundreds of eerily perfect circles were discovered on the bottom of the Mediterranean Sea, theories abounded about what they could mean. Four years of underwater research revealed a lost world.

Kurt “CyberGuy" Knutsson introduces you to HERO-BLUE, a biomimetic, multimodal locomotion robot poised to transform underwater exploration and maintenance.

One city was built around a human-made scrap of metal whereas the other lingered in the natural setting of a rocky outcrop under water.

Soft coral species in the deep sea exhibit bioluminescence, which researchers studied using remote-controlled underwater rovers. Many animals can glow in the dark.

Mining of rare metals on deep sea and ocean floors miles below the surface could create "dark oxygen" and also cause potentially harmful changes to the marine ecosystem, according to new research.

One of the largest migrations on Earth happens in the dark ocean every night, as tiny jelly-like organisms work together to emerge from the deep sea to the surface. Biologists think the ocean ...

A deep blue sea can look as dark as red wine (though not red). What did Homer say was blue? The eyebrows of Zeus! Homer uses the Greek word kyanós for that description.

Rare metals on deep sea and ocean floors miles below the surface produce "dark oxygen," and mining these minerals could cause potentially harmful changes to the marine ecosystem, according to new ...

One expectant couple asked the folks at the SEA LIFE Arizona aquarium to help surprise them and they trained a sea turtle to reveal their baby's sex.

Deep Blue Sea is lots of fun, especially by shark movie standards. But the story behind its wonky ending is something else.

New York City and swaths of Long Island are vulnerable to being consumed by the rising ocean as sea ice melts in the coming century.

The recent tragedy of the Titan submersible bore striking parallels to one of the most widely read novels about life at sea.