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The Deepest Well Ever Drilled by Man: Russians Excavated for 20 Years a Hole of 12,262 Meters, But the Temperature Increased So Much That the Project Had to Be Interrupted

Published on 15/12/2025 at 07:31
Updated on 15/12/2025 at 08:29
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Soviet Project Started In 1970 Drilled The Earth’s Crust To 12,262 Meters, Revealed Deep Water, Ancient Fossils, Extreme Thermal Limits And Ended After Financial Collapse And Gradual Soviet Historical Abandonment

Kola Superdeep Borehole in Russia Reaches 12,262 Meters Between 1970 And 1992, Faces 180°C, Loses Funding After 1991 And Is Sealed In 2008 After Gradual Abandonment.

The Kola Superdeep Borehole, Started By The Soviet Union In 1970 In Russia, Reached 12,262 Meters By 1992, Was Interrupted By Extreme Heat And Financial Cuts After 1991, Becoming A Scientific Landmark And An Example Of The Technical Limits Of Deep Drilling.

The Project Began During The Cold War With A Scientific Aim, Seeking To Penetrate Deeply Into The Earth’s Crust For Geological Research, Without Focus On Extracting Natural Resources Or Immediate Economic Returns.

According To The Travel Exploration Website The Travel, The Initiative Also Served As A Demonstration Of Soviet Technological Capability In A Context Of Strong International Scientific And Strategic Competition.

Over Approximately Two Decades, The Main Drilling Progressed Continuously Until It Reached The Record Depth Of 12,262 Meters, Becoming The Deepest Artificial Hole Ever Dug By Humans.

During Excavations, Researchers Identified Liquid Water At Great Depths, Contradicting Scientific Expectations Of The Time And Indicating Geological Processes More Complex Than Existing Models Predicted.

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Microscopic Fossils Billions Of Years Old Were Also Found, Along With Rock Compositions Different From Estimated, Expanding Knowledge About The Internal Structure Of The Earth’s Crust.

The Advancement Of The Borehole Revealed, However, A Critical Technical Challenge Related To An Unexpected Increase In Internal Temperatures, Which Became Progressively Higher With Depth.

Technical Reports Indicate That The Bottom Of The Borehole Reached About 180°C, A Value Nearly Twice As High As Initially Predicted By The Geological Calculations Used In The Planning.

Adverse Climatic Conditions

This Extreme Heat Seriously Compromised The Drilling Equipment, Causing Frequent Failures, Accelerated Wear And Substantial Increases In Operational Costs For The Soviet Scientific Project.

The Situation Became Unsustainable After The Collapse Of The Soviet Union In 1991, When State Funding Was Drastically Reduced, Directly Affecting The Continuity Of Activities On Site.

Without Sufficient Resources And Facing Technical Barriers Considered Insurmountable At That Time, Drilling Was Officially Halted Around 1992, Concluding The Ambitious Experiment.

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The Site Was Not Subjected To Deliberate Destruction, But Was Gradually Abandoned, Allowing Surface Structures To Deteriorate Over Time Due To The Region’s Harsh Climate.

For Safety Reasons, The Borehole Was Permanently Sealed With A Welded Metal Cap Around 2008, Preventing Access And Future Risks.

Despite The Premature Closure, The Kola Superdeep Borehole Left A Lasting Scientific Legacy, With Deep Geological Data Still Relevant For Contemporary Research On Earth.

With Information From CNN.

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Romário Pereira de Carvalho

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