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How Deep Have Humans Dug Underground?

From grave to Olympic swimming pools to the Paris Catacombs to the Z-44 Chayvo Well in Russia. This is how deep mankind has dug into the Earth.

THIS IS COOL. I WANT TO LEARN SOMETHING ELSE, TOO!

Video via – Tech Insider
Further Readings And References: Mental Floss, Catacombs of Paris (Wikipedia), RT

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