Quote Originally Posted by wolverine View Post
It's just there for emergency egress to street level. Unlikely you could enter from this point. I imagine it was gated along time ago.

But this tunnel is hardly the most interesting. There's plenty more beneath the entire complex of buildings.
Wolverine, you've got that right. My friend who shot the photos has taken many others and explored the building and it's infrastructure. I don't have much experience exploring abandoned buildings of Detroit but have discussed them extensively with our urban spelunkers. Most of the abandoned buildings discussed here, I was lucky enough to have gone into in their better days, including the MCD.