Edmund Fitzgerald

This Sunday marks the 49th anniversary of one of the most infamous shipwrecks in Great Lakes maritime history. There have been many theories about what sank the Edmund Fitzgerald sink in 1975. But through diving, interviews and new research, author and shipwreck enthusiast Ric Mixter says he's been able to gain a better idea of how the ship may have gone down.

The Edmund Fitzgerald sank in Lake Superior during a storm 45 years ago today (Tues.).The 729 foot freighter sank northwest of Whitefish Point in the…