Today, the deepest hole ever created by humankind lies beneath the tower enclosing Kola’s drill. A number of boreholes split from the central branch, but the deepest is designated “SG-3,” a hole about nine inches wide which snakes over 12.262 kilometers (7.5 miles) into the Earth’s crust. The drill spent twenty-four years chewing its way to that depth, until its progress was finally halted in 1994, about 2.7 kilometers (1.7 miles) short of its 15,000-meter goal.
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