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Impossible to say since it has never been achieved. The Earth's mantle is 1,800 miles thick and lies below the Earth's crust which averages around 20 to 30 miles thick. However, the deepest hole thus far drilled into the Earth, the Sakhalin-I Odoptu OP-11 Well, is only 52,575 feet deep, which is slightly less than 10 miles. So there's still some way to go to reach the mantle, never mind dig past it.

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12y ago

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