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 …
...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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knows that corporations (and individuals) !@# stuff up all the time, so miscommunications would happen.
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