* Epipelagic Zone (Sunlight Zone): This is the topmost layer, extending from the surface down to about 200 meters (656 feet). It receives abundant sunlight, which allows photosynthesis to occur.

* Mesopelagic Zone (Twilight Zone): This zone goes from about 200 meters to 1,000 meters (3,281 feet). It receives very little sunlight, and many creatures here have adapted to low light conditions.

* Bathypelagic Zone (Midnight Zone): This zone stretches from 1,000 meters to 4,000 meters (13,123 feet). It's perpetually dark, and pressure is immense. Very few creatures can survive here.

* Abyssopelagic Zone (Abyssal Zone): This zone extends from 4,000 meters to 6,000 meters (19,685 feet). It's the largest zone in terms of area, with extremely cold temperatures and high pressure.

* Hadalpelagic Zone (Hadal Zone): This is the deepest zone, starting at 6,000 meters and going down to the ocean floor, which can reach depths of over 10,000 meters (32,808 feet). It's named after Hades, the Greek god of the underworld, due to its extreme conditions.

Therefore, the Hadalpelagic Zone is the deepest zone of the ocean.