I remember that History type channel program on the Edmund Fitzgerald.
As I recall the (in my opinion the thoroughly convincing) evidence pointed to a cause due to improperly secured hatches.
I read a theory somewhere, maybe here on FR, that she was so heavily loaded and roller coasting up and down those big 25 foot waves that her bow hit the bottom and it broke her spine.
That theory seemed logical to me considering she is broken in half.