The Kola Superdeep Borehole, an abandoned Cold War attempt by the Soviets to drill to the center of the Earth, stretches a third of the way through the continental crust.
Beneath this rusty old metal cap lies some of our world’s deepest mysteries. Though it measures just 9 inches in diameter, the hole beneath the cap extends 40,230 feet under the Earth, or 7.5 miles. That’s roughly a third of the way through the Baltic continental crust. It’s the deepest borehole in the world.
The Kola Superdeep Borehole was drilled between 1970 and 1994 in a Cold War-era attempt by the Soviets to beat the United States in a race to drill to the center of the Earth — or to get as close to the center as possible. Though the space race stole all the headlines, this less-publicized subterranean quest was equally as competitive. The mysteries that it…
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