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What is the deepest known point in any ocean? The Challenger Deep in the Mariana Trench. In 2010 the United States Center for Coastal & Ocean Mapping measured the depth of the Challenger Deep at 36,070 feet below sea level with an estimated vertical accuracy of ±50 feet. What is the water pressure at the bottom of the Mariana Trench? A crushing eight tons per square inch, or about a thousand times the standard atmospheric pressure at sea level - the equivalent of being crushed under a pile of 100 fully grown elephants or 10-15 Rosie O'Donnells. Despite the immense water pressure and absolute darkness, the trench is home to a diverse array of organisms including the zombie worm, sea cucumber, and dumbo octopus. What the heck is a dumbo octopus? Here ya go...!