That graphic reminds me of the second “Hunley” sinking — the one that killed (and probably was caused by) Horace.L. Hunley, himself.
I have long been interested in what happened to the Hunley, and I think it was last year that I was told (In a discussion here on Free Republic) what seems to be the most likely cause of it sinking.
I would be interested in hearing why you think Horace L. Hunley might be responsible for it's sinking.