Before revision: The majority of the ocean is aphotic, with the average depth of the sea being 4267 m deep with the deepest part of the sea, being the Challenger Deep in the Mariana Trench, is about 11,000 m deep.
After revision: The majority of the ocean is aphotic, with the average depth of the sea being deep with the deepest part of the sea, being the Challenger Deep in the Mariana Trench, is about deep.