Why Did the Russians Seal Up the Kola Superdeep Borehole?
The Kola Superdeep Borehole is the deepest man-made hole on Earth. Why dig the Russians this deep, and why did they stop?
Source: howstuffworks.com
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The Kola Superdeep Borehole is the deepest man-made hole on Earth. Why dig the Russians this deep, and why did they stop?
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