Next recommendation is the T.D.I. course..L.Mich wreck diving is nothing that your going to learn on a weekend specialty course.first you will have to learn how to dive L.Mich. at 130ft/38 degrees water temp. Learn about the elements/gear. Find a LDS that caters to the commercial divers. Get involved with a group of experienced L.Mich. divers. I also sent you a Facebook friend request. My L.Mich. video’s are stored on my timeline.