the great lakes are the "bermuda triangle" of the north. lots of shipwrecks, plane disappearances, etc. the cold, fresh water preserves them in it pristine condition. there are countless wrecks that are recreational dives (0 -60ft)....some are advanced ( 60-120) and a lot are technical dives ( 120+)...all are FREAKING COLD dives. however, the cold, fresh water preserves the wrecks like the day they went down. boys, i know of a few warbirds that have vanished there. and i would bet...are in just as pristine condition. if we can find them.....