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Coddy
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I found this interesting snippet of information

 

The deepest ocean is the Pacific Ocean, with an average depth of 4.028 metres and the deepest part of the Pacific Ocean is the Marianen trough, near Guam, between Japan and New Zealand.

In 1951 the British investigation ship Challenger II measured a depth of 10.923 metres (35.813 feet) in the Marianen trough, which is called Challenger Deep. In 1960 the bathyscaphe Trieste, with Jacques Picard and John Wals aboard, dived into Challenger Deep to 10.910 metres deep.

 

The Marianen trough is 11.770 metres deep at its deepest known point, whereas the Everest is only 8.848 metres high. If you were to throw an iron ball of 1 kg into the ocean it would reach the bottom of the Mariana trough after a descent of 64 minutes.

 

So how much lead would you need to hold bottom??????? blink.gifblink.gif

 

Regards

 

Coddy

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