https://preprod.bigthink.com/tag/kola-superdeep-borehole/
kola superdeep borehole Archives - Big Think
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https://hackaday.com/2018/10/19/superdeep-borehole-samples-create-non-boring-music/
Superdeep Borehole Samples Create Non-boring Music | Hackaday
Oct 19, 2018 - In the 1970s, the Soviet Union decided to dig a hole for science. Not just any hole, the Kola Superdeep Borehole reached a depth of over 12 kilometers, the...
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