Dive Chicago

I’m on a US city adventure kick right now, trying to find some adventuresome things to do
in big US cities. I was looking for some interesting, but unusual, diving in the US, and found
this place that does diving expeditions in Lake Michigan. Yes,
Lake Michigan.

And what, you might ask, is down there at the bottom of Lake Michigan, anyway?
Lots of wrecks, apparently. And also lots of salmon, trout, carp,
burbot (woo hoo! burbot!). Anyone ever do this? Buehler? Cosimo?