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Why Did the Russians Seal Up the Kola Superdeep Borehole?

The Kola Superdeep Borehole is the deepest man-made hole on Earth. It's so deep, that locals swear you can hear the screams of souls tortured in hell. Why did the Russians dig this deep, and why did they stop?

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Why Did the Russians Seal Up the Kola Superdeep Borehole?
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    Why Did the Russians Seal Up the Deepest Hole in the World?

    Why Did the Russians Seal Up the Deepest Hole in the World?

    Key Takeaways The Kola Superdeep Borehole, located in Russia, is the world's deepest man-made hole, reaching a depth of 40,230 feet (12,262 meters) or …

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