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How deep is the ocean?

The average ocean depth is 3.7 kilometers (2.3 miles).

The Spanish Dancer, a type of sea cucumber, hovers at 2,789 meters (9,150 feet) near the Davidson Seamount off the coast of California. That's 2.74 kilometers (1.7 miles) down!

The average depth of the ocean is about 3,688 meters (12,100 feet). The deepest part of the ocean is called the Challenger Deep and is located beneath the western Pacific Ocean in the southern end of the Mariana Trench, which runs several hundred kilometers southwest of the U.S. territorial island of Guam. Challenger Deep is approximately 10,935 meters (35,876 feet) deep. It is named after the HMS Challenger, whose crew first sounded the depths of the trench in 1875.