What is the deepest part of the ocean?

The deepest parts of the ocean floor are caused by plate tectonic subduction and occur where the sea floor sinks back into the mantle in a subduction zone. These areas are called deep sea trenches and the Challenger Deep in the Mariana Trench in the Pacific is the deepest known point in Earth's oceans at 10,994 meters (36,070 feet) below sea level.

The Challenger Deep in the Mariana Trench in the Pacific Ocean is the deepest known point in Earth's oceans.