Russia tried to dig a hole through the Earth’s crust in the 1970’s. They reached 40,318 feet deep before they stopped. It is still the deepest hole humans have ever dug.
The Deepest Hole
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Russia tried to dig a hole through the Earth’s crust in the 1970’s. They reached 40,318 feet deep before they stopped. It is still the deepest hole humans have ever dug.