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Sounding the Deepest Spot on Earth | National Geographic

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Published on Mar 8, 2012

Challenger Deep in the Mariana Trench near Guam is the deepest spot on Earth. How do we know? We didn't look for it. We listened.
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Sounding the Deepest Spot on Earth | National Geographic
https://youtu.be/mdcru96d_tc

National Geographic
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