Qualla: Kola Superdeep Borehole

Kola Superdeep Borehole: Introduction

Fri, 27 Mar 2026 00:00:00 GMT

Photo credit Alexander Novikov, CC BY-SA 4.0. Somewhere on the Kola Peninsula, near the Norwegian border, a rusted metal cap bolted to the ground is all that marks the deepest point humans have ever reached into the Earth. Twelve kilometers and 262 meters straight down. That is deeper than the ocean's deepest trench is deep, deeper than Mount Everest is tall. The Kola Superdeep Borehole began as a Soviet scientific drilling project in 1970 with a modest target of 7,000 meters, then kept going for two decades, and what it found along the way contradicted nearly everything geologists thought they knew about the structure of the continental crust.

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Image: Alexander Novikov | CC BY-SA 4.0

Kola Superdeep Borehole: Drilling Into the Unknown

Fri, 27 Mar 2026 00:00:00 GMT

Photo credit Alexander Novikov, CC BY-SA 4.0. Work began on May 24, 1970, using the Uralmash-4E, a standard oil well drilling rig slightly modified for the job. By 1974, ambitions had grown: a purpose-built Uralmash-15000 rig was installed, named for the new target depth of 15,000 meters. On June 6, 1979, the borehole broke ...

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Image: Alexander Novikov | CC BY-SA 4.0

Kola Superdeep Borehole: Everything the Textbooks Got Wrong

Fri, 27 Mar 2026 00:00:00 GMT

Photo credit Alexander Novikov, CC BY-SA 4.0. The scientific discoveries were as remarkable as the engineering. Geologists had predicted, based on seismic data, that a layer of basalt would appear at roughly seven kilometers depth. It never did. Instead, the drill kept cutting through granite far deeper than anyone expected....

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Image: Alexander Novikov | CC BY-SA 4.0

Kola Superdeep Borehole: The Heat That Won

Fri, 27 Mar 2026 00:00:00 GMT

Photo credit Scanned and processed by Mariluna, Public domain. Temperature was the project's ultimate adversary. At 12,262 meters, rock temperatures reached approximately 180 degrees Celsius -- significantly hotter than models had predicted. At these temperatures, the rock itself behaved less like a solid and more like a plastic substance, c...

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Image: Scanned and processed by Mariluna | Public domain

Kola Superdeep Borehole: Abandoned but Unmatched

Fri, 27 Mar 2026 00:00:00 GMT

Photo credit Alexander Novikov, CC BY-SA 4.0. The project officially ended in 1995. The scientific team was downsized and given the task of studying the data already collected. The site was eventually abandoned. Visitors who make the journey to the remote spot in Russia's Pechengsky District report that the structure over th...

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Image: Alexander Novikov | CC BY-SA 4.0