How the CSS Hunley crew died

Maybe.

“(W)hen a torpedo blows something up underwater, it creatures pressure waves that reverberate in the water and through the body of anyone who happens to be in it. The instantaneous increase in pressure can squeeze oxygen out of the lungs and pop blood vessels in the brain. The effects are often deadly.

“But the damage occurs exclusively in a victim’s soft tissue, like the gut, lungs and brain - from the outside, it can be impossible to tell that the person has been harmed.”

http://www.theledger.com/news/20170824/science-may-have-solved-sunken-civil-war-sub

Link at http://knuckledraggin.com/2017/08/mystery-solved-by-the-whiz-kids/