Re:Quaise Energy – Unlocking the true power of clean geother...
by tgsovlerkhgsel on Sunday April 10, 2022 @09:12AM
(#30976681)
And that was over three decades ago, you'd kind of expect technology to advance a bit in that time.
12.2 km - https://en.wikipedia.org/wiki/Kola_Superdeep_Borehole