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Q&A How deep can underground tunnels be within the scope of science?

Problems for humans The deepest tunnel-like structure created so far is the TauTona Mine in South Africa. The bottom of it is 2.4 miles below the surface. Temperatures there can reach 131°F, whic...

posted 9y ago by HDE 226868‭

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#1: Attribution notice removed by user avatar System‭ · 2020-06-01T14:13:44Z (over 4 years ago) 
Source: https://worldbuilding.stackexchange.com/a/12243
License name: CC BY-SA 3.0
License URL: https://creativecommons.org/licenses/by-sa/3.0/