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Earth Observatory of Singapore - At just nine inches in diameter, the Kola Superdeep Borehole is the deepest hole that humans have ever dug. It took 20 years to drill to a
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Earth Observatory SG on X: "At just nine inches in diameter, the Kola Superdeep Borehole is the deepest hole that humans have ever dug. It took 20 years to drill to a
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In a geologic triumph, scientists drill a window into Earth's mantle - The Washington Post
geography - What is the deepest we have ever gone into the Earth? - Earth Science Stack Exchange
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Quest to drill into Earth's mantle restarts | Geology Page
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Scientists plan to drill all the way down to the Earth's mantle
