Milwaukees deep tunnel that stretches for miles underneath Milwaukee, WI. to help with storm water runoff and prevent flooding. http://v3.mmsd.com/DeepTunnel.aspx
http://www.todaystmj4.com/news/local/143748536.html
Entrance to Milwaukee's Deep Tunnel
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By CheesyCheetah @ 2012-03-25 03:59:33