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Icy cold, pitch black and with crushing pressures - the deepest part of the ocean is one of the most hostile places on the planet. Only three explorers have made the epic journey there: 11km (seven miles) down to the bottom of the Pacific Ocean's Mariana Trench. As a new wave of explorers is gearing up to make this remarkable dive, take a look at the mysterious world that they will be plunging into.
2012-02-23
submarine depth ocean diving pressure