Earth turned solid rock into something like plastic. 🕳️ . . . Russia's Kola Superdeep Borehole reached 12,262 meters in 1989 after nearly 20 years of drilling. At the bottom, temperatures hit 180°C—about 80°C hotter than expected. The machinery did not reach hell; it reached rock too hot and pliable to drill.
Source
BBC Future, 2019, 'The deepest hole we have ever dug'
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