The unusual cephalopod was spotted on a recent underwater research expedition.

Historically thought to be a refuge for coral growing in the shallows, coral reefs from oceanic depths face similar threats, finds a new study.

Meet Cindy Van Dover, a deepsea explorer and the first female to pilot Alvin, the submersible that has ferried researchers into some of the ocean's deepest depths.

The Atlantic has been free of intense air-gun blasts to probe for oil and gas for 30 years, and researchers fear for endangered North Atlantic right whales and other animals.

Scientists have discovered a new type of eye cell in a deep-sea fish species.

As technology takes science deeper into the world’s oceans, researchers are discovering reef systems far from warm, shallow tropical waters.

See footage from the expedition that discovered a coral reef hiding beneath the massive muddy plume at the mouth of the Amazon River.

In his bathysphere, William Beebe plumbed the ocean to record-setting depths.

See how William Beebe and Otis Barton descended to the ocean's depths in an early submersible designed to allow access to the mysterious lifeforms inhabiting the deep sea.