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On the surface, what about the long term effects of boring giant holes and tunnels through underground?

There was a previous Swedish tunnel project that had a number of incidents, among others groundwater pollution caused by a new sealing compound that contained acrylamid

https://en.wikipedia.org/wiki/Hallands%C3%A5s_Tunnel

Probably most of it is rock, and the tunnel is probably sounded by concrete.

Regardless, I have no doubt the Swedes did an analysis and weighted the pros and cons.

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