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bottomless rule
(lemm.ee)
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this post was submitted on 27 Aug 2024
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there is the Kola Superdeep Borehole, I think a Soviet Union experiment to find out how far they could drill, over 12 KM down (which is not quite through the earth's crust).
Not bottomless, but far enough to get that sense of bottomlessness. Not very wide, though.