An international team looks back 12 million years for clues about the formation of these vast areas where no life can survive A satellite image of the Northern Gulf of Mexico, where 'dead zones' can ...

Ocean depth is divided into zones: littoral, bathyal, abyssal and hadal. The deepest part of the ocean, the hadal zone, is anywhere deeper than six kilometres. What is the average depth of the ocean?

The open ocean’s twilight zone, a vast deep ecosystem rich in fish biomass, is poorly understood because it is expensive and challenging for humans to reach its depths 200–1000 meters (660 ...