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Inside the Soviet Union’s Deepest Hole That Revealed Earth Was Not What Scientists Expected
https://www.bioscience.com.pk/en/subject/science/in-1970-the-ussr-began-drilling-a-hole-12-262-meters-deep-then-stopped-scientists-found-a-world-behaving-differentlyTo reach these depths, engineers employed the specialized Uralmash-15000 rig, which utilized a turbine powered by drilling mud pumped from the surface. Because the drill string weighed over 200 metric tons, simply replacing a worn bit required an...
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