More than one-fifth of the global ocean—an area spanning more than 75 million sq km—has been the subject of ocean darkening over the past two decades, according to new research. Ocean darkening occurs ...

The oceans cover over 70% of the Earth’s surface. The marine ecosystem is the largest and most abundant in the world. But most of the ocean is permanently dark and incredibly difficult to observe. As ...

The mesopelagic zone is the chilly, dimly lit layer of ocean found 200-1,000 meters (660-3,300 feet) below the surface, which scientists say plays key roles in the marine food web and carbon cycle. On ...

Oceanic manta rays dive to record depths of 1,250 meters (4,100 feet), according to a first-of-its-kind study to examine in detail the extreme deep-diving behavior of these rays. Researchers tracked ...

Delegates at the IUCN World Conservation Congress in Abu Dhabi voted to adopt a motion urging precautionary measures to protect the ocean’s mesopelagic zone. The nonbinding motion calls for ...