The deepest part of the ocean is, of course, the Mariana's Trench. Just to clarify, I’m not talking about the Canadian pop punk band, but deepest part of the world’s oceans located in the Western Pacific Ocean (a lot less musical, just as interesting). It reaches a maximum known depth of 10.994km (this is greater than the height of Mt.Everest), has a width of 69km, and is about 2500km long.
However, contrary to popular belief and common sense, “the deepest part of the world’s ocean” does not equal “the part of the seafloor closest to the center of Earth.” This is because the Earth is not a perfect sphere; its radius is about 25km less at the poles that at the equator.
Therefore, parts of the Arctic Ocean seabed are at least 13 km closer to the Earth’s center than Mariana’s Trench. But hey, they there’s no band named “Parts of the Arctic Ocean Seabed.”