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Re:Ask HN: How do I start building an underground community by brodouevencode on Tuesday September 22, 2020 @10:11AM (#24554534)
There's a whole complex system of pumps and drains that take care of this. Same is true for any subway system, underground parking, etc. It ain't gonna be cheap though.

EDIT: shotcrete will help some, but is not a solution to. You need a membrane as all concrete is permeable.

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