The Deepest Hole Ever Dug on the Planet: What the Soviets Wanted 12 Km Underground — And Why They Gave Up After Two Decades and Heavy Investments

Written by Romário Pereira de Carvalho

Published on 06/10/2025 at 14:54

Updated on 06/10/2025 at 14:55

Tampa do poço de kola: Alexander Novikov

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For More Than Two Decades, Soviet Scientists Drilled the Soil of the Kola Peninsula in Search of Deep Geological Knowledge, Facing Extreme Heat, Technical Failures, and the Collapse of the Soviet Union That Led to the End of the Project

The Kola Superdeep Borehole, located in the far north of Russia, is still remembered as one of the boldest scientific projects of the 20th century. Created by the former Soviet Union, the experiment of the ‘deepest hole in the world’ aimed to explore the deepest layers of the Earth’s crust but was eventually abandoned decades later.

The Scientific Race of the Cold War

Started in 1970, the project was born at the height of the Cold War. The drilling had no economic ends, as it was not looking for oil or minerals.

The purpose was strictly scientific: to reach the deepest point possible to study the composition of the planet.

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Technical Challenges and Unbearable Temperatures in the Hole

The progress, however, came at a price. The heat found in the inner layers surprised scientists. Measurements indicated temperatures close to 180 °C — nearly double what was expected.

Because of this, the drill bits and cables used for drilling began to deform. With every additional meter, the resistance increased, and costs became prohibitive.

Even with cutting-edge technology, the metal structure could not withstand the extreme conditions.

The Collapse and Abandonment of the Deepest Hole in the World

In addition to the technical problems, the collapse of the Soviet Union in 1991 represented the final blow. With the end of state funding, the project was officially closed the following year.

The site ended up being abandoned, and over time, the facilities began to deteriorate. Intense winds and constant snow accelerated the destruction.

For safety, the well was finally sealed with a welded metal cap in 2008.

Even without reaching the Earth’s core, the Kola Borehole remains a landmark of engineering and human curiosity about what lies beneath our feet.

With information from CNN.

The Deepest Hole Ever Dug on the Planet: What the Soviets Wanted 12 Km Underground — And Why They Gave Up After Two Decades and Heavy Investments

For More Than Two Decades, Soviet Scientists Drilled the Soil of the Kola Peninsula in Search of Deep Geological Knowledge, Facing Extreme Heat, Technical Failures, and the Collapse of the Soviet Union That Led to the End of the Project

The Scientific Race of the Cold War

Technical Challenges and Unbearable Temperatures in the Hole

The Collapse and Abandonment of the Deepest Hole in the World

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The Deepest Hole Ever Dug on the Planet: What the Soviets Wanted 12 Km Underground — And Why They Gave Up After Two Decades and Heavy Investments

For More Than Two Decades, Soviet Scientists Drilled the Soil of the Kola Peninsula in Search of Deep Geological Knowledge, Facing Extreme Heat, Technical Failures, and the Collapse of the Soviet Union That Led to the End of the Project

The Scientific Race of the Cold War

Technical Challenges and Unbearable Temperatures in the Hole

The Collapse and Abandonment of the Deepest Hole in the World

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