Mute
Joldmar Filho
The Kola Superdeep Borehole is 12,262 metres deep — and 23 centimetres wide. Nine inches. About the width of a dinner plate. Soviet engineers drilled for 22 years and stopped in 1989. Not because they reached the mantle. Because at 180 °C the rock stopped behaving like rock, turned plastic, and started flowing back into the hole faster than they could drill it out. The record still stands. China's Shenditake 1 finished in February 2025 at 10,910 metres — still 1,352 metres short.
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