Concrete is not airtight, but serves as good base for applied elastometric coatings. ...or vitrified if you happen to have rock & sunlight!https://twitter.com/Octapode/status/852609117424418819 …
obviously, if that was going to be a plot point, you'd want to do some thinking about the security infrastructure around airlocks
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...especially bc in a diversified economy, the tunnel owners might not want to ALSO own and maintain the airlocks - you want ...
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ALMAS (air lock maintenance as a service). And while a naive ancap might say "markets make everything perfect", anyone in the real world
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