The World’s Deepest Hole

In 1970, Soviet scientists started drilling the Kola Superdeep Borehole in Murmansk, Russia. They wanted to learn about Earth’s crust, and they wanted to beat American scientists who had abandoned their Project Mohole in 1966.

After 24 years of digging, and several branches in the hole, the deepest branch of the Kola Superdeep Borehole stopped in 1994 at 12,262 meters (about 7.5 miles). It’s only nine inches in diameter at the bottom. It is still the deepest hole in the world, and the process of drilling was incredibly difficult. (For reference, the Mariana Trench is approximately 10,994 meters deep at The Challenger Deep—and it’s not a drilled hole.)

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