Was it really lost? Sounds exciting but something unused for only a decade would not rate as lost in my book. Here in Chicago they had a tunnel system that was unused for multiple decades. Caused a big flood some years back when some workers knocked a hole through the tunnel that ran just under the river. A lot of building basements all over downtown got a bit soggy. For me it still is interesting to see things frozen in time because it is forgotten or unused.
I didn't click through the link (time constraints), but I assume it is talking about the same system that came up here a while back...there is a link to the route, and maybe a cancel or two (unconfirmed): https://goscf.com/t/13351
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