The Deepest Hole in the World, Kola Superdeep Borehole, Was Sealed

Summary
The Kola Superdeep Borehole in Russia is the deepest hole in the world. It's deeper than the Mariana Trench and deeper than Mt. Everest is tall. Why did the Russians dig this deep, and why did they stop?
Description from Howstuffworks.
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The Deepest Hole in the World, Kola Superdeep Borehole, Was Sealed
The Kola Superdeep Borehole in Russia is the deepest hole in the world. It's deeper than the Mariana Trench and deeper than Mt. Everest is tall. Why did the Russians dig this deep, and why did they stop?
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