How deep is each zone?
How deep is each zone? The ocean is divided into five zones: the epipelagic zone, or upper open ocean (surface to 650 feet deep); the mesopelagic zone, or middle open ocean (650-3,300 feet deep); the bathypelagic zone, or lower open ocean (3,300-13,000 feet deep); the abyssopelagic zone, or abyss (13,000-20,000 feet deep); and the ...
Has anyone been to the bottom of the Mariana Trench?
Nobody has walked on the bottom of the Mariana trench, but six people have descended to it in submersibles.