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  1. Why Did the Soviet Union Stop Drilling at 40,230 Feet on the Kola Peninsula If They Wanted to Reach the Mantle? In the 1970s, the Soviet Union embarked on an ambitious project known as the "Kola Superdeep Borehole." The name alone might not fully capture the sheer audacity of this endeavor, but if we put it another way, many would immediately exclaim: "What were the Soviets thinking?!" In reality, this...
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    Why Did the Soviet Union Stop Drilling at 40,230 Feet on the Kola Peninsula If They Wanted to Reach the Mantle?
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