A 13-year-old boy stumbled upon the Lost Sea, North America's largest underground lake, in a Tennessee cavern. With underwater passages yet to be fully explored, this vast hidden world is home to ...

Researchers retrieved reef monitoring devices that had been placed in deep coral reefs in Guam. The devices were placed up to 330 feet below the surface.

A small fossil reveals that the largest freshwater fish, Otophysans, emerged in the sea, not in rivers, changing the ...

The War Between The Land and The Sea finale – episode 5 – spoilers follow.

Diver John Roney shared mesmerizing video footage from his last dive — a close-up of the world's largest lion's mane jellyfish.

Scientific divers have navigated a series of treacherous dives more than 330 feet deep in an attempt to unravel the mysteries of deep ocean reefs. They’re finding new species — and evidence of both cl ...

Careful reanalysis of data from more than a decade ago indicates that Saturn's biggest moon, Titan, does not have a vast ...

This video explores the whale shark, the largest fish in the world, and the unique traits that allow it to reach ...

For deep reef divers, descending into the ocean’s mesophotic layer can feel like exploring the moon. Discovering never-before ...

Sharks have had a tough time since the 1970s, when overfishing, habitat loss and a growing trade in their fins began to cut ...

In the ocean, everything relies on tiny plankton.These provide nutrients for animals at the bottom of the food web which are eaten by larger species, and so on. At the top of the food chain, large ...

The Great African Expedition launched from the Baltic port of Kaliningrad in August 2024. An orchestra played “When the Saints Go Marching In” and a priest blessed the crews with holy water. Officials ...