I guess the sceniro was that there was this chemical spill and people were dressed up like tress and they scared you. Also, at the end you go through this old helicoptor type thing. It was pretty cool, anyone been there and know if its still there?
There was a Silo X near Oakland U back in 1997. It did have a helicopter at the end with a guy slumped over the controls ready to scare people. I thought it was one of the best haunted houses in MI
I'm not sure about Michigan, but we have Silo X here in St. Louis Missouri...