Mansion Tunnels

Urban exploration outside of the Ozarks area
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GreatWater
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Mansion Tunnels

Post by GreatWater »

I was told a few years back that old lumber baron mansions in Bay City, MI were connected by tunnels. I was also told that they still exist and are still used. There are also tunnels nearby under hell's half mile on the river front. I was looking for help confirming any possible portals of entry. Anyone up for the challenge?
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