Why the USSR Stopped Drilling at 12,262 Meters Came Down to an Unexpected Limit

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12,262 meters

deepest borehole depth

12,262 meters down, the Soviet SG-3 Kola Superdeep Borehole set the world record for the deepest hole ever drilled after a project that began in 1970 aiming for 15 kilometers. The effort ultimately ended in 1992 when extreme heat and…