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WanderingEng · 2645 days ago · link · · parent · post: TIH: October 5, 1869- The Hennepin Island Tunnel Disaster
Thanks, I didn't know about this. Digging a bit to try to understand it more brought up this page: http://drainfreak.com/df/twincities/east/ Not only does it have a map (the pink) that shows where the tunnel was and where it eroded further, but they say they found an entrance and explored some of the remaining tunnel.