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What is the deepest whole ever dug by mankind?

deepest dug earth Geology mankind physical sciences
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What is the deepest whole ever dug by mankind?

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the deepest hole ever dug by mankind was one in Murmansk, Russia in an effort to penetrate the Earth’s Mantle for geologic study. At last count it had reached a depth of 40,000 feet (12,192 Meters) and had taken over 40 years to dig with modern technology. Unfortunately, it was unsuccessful at penetrating the Earth’s Mantle. http://www.seawana.com/conspiracy.

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