Victor Vescovo claims to have set the record for the deepest ocean descent by a human. The director of Titanic demands to differ.

How deep is the deep end of the ocean? The answer turns on an array of factors nearly as wide as the sea itself: the barometric pressure over the site in question, the seawater's density and temperature, the vagaries of measurement and, perhaps, on whether a world record is at stake.

The whereabouts of the planet's deepest spot is widely agreed upon: the Challenger Deep, a muddy depression nearly 7 miles (11km) down in a long fissure

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