The deep sea begins at about 200 meters below sea level, where light starts to diminish in a region called the twilight zone.

The deep sea refers to the part of the ocean below 200 meters (656 ft.), at which light begins to disappear. Despite making up more than 90% of the Earth’s marine environment, much of the deep-sea ...

Researchers say our understanding of Earth’s largest biome is based on a tiny, unrepresentative sample dominated by just a few countries.

That works out to about 0.001% of the deep sea, according to a study published Wednesday in Science Advances. In other words, 99.999% of the deep sea, defined as deeper than 200 meters ...

There is currently no commercial deep-sea mining happening anywhere in the world, though companies have been pushing for years. They appear to have found a new champion in Trump. In April ...

Humanity has only explored 0.001% of the deep sea, according to a May 2025 study. Credit - Getty Images The Trump Administration signed an executive order late last month aiming to fast-track ...