Why did the Kola Superdeep Borehole project stop after reaching about 12 km?
Show answer & explanation
Answer: Funding and equipment limits prevented further drilling
The drill reached the mantle, which no tool can penetrate — The borehole remained within the continental crust, not the mantle. Reaching about 12 km was an engineering achievement, not evidence that a universal, undrillable boundary had been reached.
Funding and equipment limits prevented further drilling ✓ — Funding and equipment problems ended the attempt to drill deeper. At great depths, heat, pressure and the weight of the drilling equipment create major engineering limits. The project did not simply encounter rock that melted at 180 degrees Celsius.
A continuous diamond layer made the drill unable to cut — A continuous diamond layer did not stop the project. Drilling equipment faces wear, stress and high temperatures at depth, but a hypothetical diamond barrier is not the documented reason work ended.
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