World big hol

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Drilling began on 24 May using the Uralmash -4E , and later the Uralmash series drilling rig. The Kola Superdeep Borehole was the longest and deepest borehole in the world for nearly 20 years. Deep drilling in crystalline bedrock, v. This water, unlike surface water, must have come from deep-crust minerals and had been unable to reach the surface because of a layer of impermeable rock. Archived from the original PDF on 30 October By using this site, you agree to the Terms of Use and Privacy Policy.

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