Mariana Trench: James Cameron on Earth's Deepest Spot: Desolate, Lunar-Like

"We think that much of the water that goes down at the Mariana trench actually comes back out of the earth into the atmosphere as water vapor when the volcanos erupt hundreds of miles away," says Doug Wiens, professor ofFilmmaker James Cameron gives two thumbs-up as he emerges from the Deepsea Challenger submersible, March 26, 2012, after his successful solo dive in the Mariana Trench, the deepest part of the ocean. The dive was part of Deepsea Challenge,Director James Cameron has

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