331 () posted 3 years ago by BQnita 3 years ago by BQnita +332 / -1 53 comments share 53 comments share save hide report block hide replies
That salt deposit goes under Lake Huron from Detroit all the way to Drummond Island off the tip of the UP. It is closed to the public these days.
Wow! no shit? I've always wanted to sneak into them.