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.

The most extreme heat event on the planet right now is happening not on land but at sea. A prolonged, record-smashing marine heat wave is scorching the Mediterranean, where water temperatures have hit ...

Proponents say they want to dredge the seafloor for metals needed for clean technology. Indigenous Pacific Islanders call it a threat to life, culture, and the ocean itself.

A dome-fronted submersible sinks beneath the waves off Indonesia, heading down nearly 1,000 meters in search of new species, plastic-eating microbes and compounds that could one day make medicines.

An ocean-mining company has funded some of the most comprehensive scientific studies of the deep seabed to date, and peer-reviewed results have begun to emerge. A collage of foraminifera, a kind of ...

Some countries, including the U.S., want to mine the seafloor for rare earth elements used in smartphones and electric cars. But other nations are concerned about the environmental impact. Sponsor ...