The hole is now known as Kola Superdeep Borehole.
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Entering 3 kilometers, the temperature began to turn into heat. Its peak is at kilometer 12, the temperature reaches 180 ° Celsius until the project is stopped.
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The temperature exceeded the researchers' estimates and made the boring machine broken.
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this hole becomes the deepest hole in the earth, even beyond the depth of the Mariana Trench.
