How deep can a submarine go?



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    Richard Branson later this year will finance a voyage to the greatest depths a submarine has ever traveled. His submarine, named Virgin Oceanic, will start by going to the deepest point in the Mariana Trench, the bottom of which is the deepest point on the planet, 7 miles. Branson plans to continue his tour to include the deepest points of the world’s five oceans. 

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