Well got camera down to take a look. Water clarity was not greatest so only could see it up close could not get a real good big picture of it. But what did see is that it looked wooden with bands wrapped around it. Like a whiskey barrel. We could see writing on bands, but could not make out what it said. the top dome part had cables strung threw it like you see on sonar photo.
Funny thing was soon as buddy dropped camera down he saw a nice walleye sitting right on top of it. It swam right up to camera and then swam away. Tried jiggin area with jig and minnow no takers.
I plan on in future getting my son inlaw's gopro and dive down and get better look. I will post recording of my findings. May be alittle bit though, our water temps are still pretty low below surface.