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At a depth of 11,034 metres, the Mariana Trench is the lowest point on the surface of the Earth’s crust. It’s one of the most forbidding spots on the planet — home to organisms resembling some of the earliest life-forms — and in its nine million year history, humans have only visited twice.

Richard Johnson takes a look at the scale of the task and the hardware the two moguls are using in their planned voyages to the bottom of the sea.

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• Email: rjohnson@nationalpost.com

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