Don't know about submarines (nasty,sneaky,claustrophobic things),although I did hear something about the origins of the expression "Shit Shoot " coming from that area of operations. But I do remember Pusser's Izal being virtually indestructible ; we of the carrier" Eagle" ( the only carrier to have been asked,in error of course, " Why have you surfaced ? " ), all 2,750 of us,used to leave great long trails of the stuff strung out across the world's oceans.It was often still there,little altered ,on the way back !!