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Mariana Trench -

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The Challenger Deep is the deepest known part of the world's oceans. Situated 200 kilometres down
in the Mariana Trench, it's deeper than Everest is high. The only humans ever to have reached the
bottom of the world were Jacques Piccard and Don Walsh in the deep diving vessel the Trieste, way
back in 1960. Fifty years on and no-one has dared to emulate their heroic feat.

NARRATION

In 1953 Hilary and Norgay reached the top of the world, nearly eight and a half kilometres above
sea level. Seven years later Don Walsh and Jacques Piccard outdid them by a whooping two
kilometres, the other way. They plunged to the lowest point on the earth's surface known as the
Challenger Deep in the Mariana Trench. But this was no snorkel and goggles job, they travelled in
the US Naval submarine, The Trieste.

For twenty minutes they sat cramped and cold at the deepest part of the ocean under pressure more
than a thousand times that on the surface. But imagine the amazing photographs and scientific
observations they made. Well you'll have to imagine because they kicked up so much sludge from the
bottom they couldn't see a thing.

Topics: Others

Reporter: Daniel Keogh

Producer: Nicky Ruscoe

Researcher: Mark Horstman

Editor: James Edwards