When most of us picture the ocean, we imagine turquoise waves, colorful reefs, and shoals of darting fish. But that’s only ...

The Titanic lies about 12,500 feet under the ocean. The pressure down there is so immense that even submersibles supposedly built for those conditions can, as we know, tragically fail. Now imagine ...

Thousands of feet down in the Gulf of Mexico, an orange-eyed sea creature carrying dozens of eggs perched near a chemical vent. The “squat” animal had been documented by submersibles several ...

Creatures like the ghost fish, dumbo octopus and deep sea urchin are examples of animals that have adapted to their unique deep-ocean environment. But their habitat and that of many other marine ...

The solution came in the form of a stoplight fish, which has an organ that emits red light under its eye. "So most [deep-sea] animals produce only blue light and see only blue light," says Widder.

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.

NEW YORK — Scientists for the first time have uncovered an underworld of animal life thriving beneath the seafloor.

Australian researchers searched deeper than scuba divers and submarines could go. Cameras explored the frigid sea bottom, under enormous pressure, down to 3.6 miles under the surface.

Transparent-faced fish drift through dusky waters. Snowlike flecks of dead plants sift down from the world above. Soft ...

Journey Under the Sea With 15 Amazing Photos of Marine Life These Smithsonian Magazine Photo Contest images feature the captivating creatures that live beneath the waves ...