James Cameron, a film-maker by profession and an explorer by nature, is going deep. Very deep. Sometime in the coming weeks he'll squeeze into a one-man submersible and dive to the bottom of the Challenger Deep, the deepest known point in the world's oceans. Located in the Mariana Trench, it is almost seven miles down (significantly deeper than Everest is high). It's another world.

Here's Nat Geo on the mission:

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