TIL about the KOLA superdeep borehole, with 40,000 ft or 7.6 miles which is the deepest artificial hole on earth. The “well to hell” urban legend originated from here, where workers allegedly heard noises of the tortured souls through a microphone lowered into the hole.

Read more: https://en.wikipedia.org/wiki/Kola_Superdeep_Borehole

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  1. I remember seeing this on the science Channel. It’s hilarious this resulted from a literal hole digging competition between the USA and the USSR.

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