The confirmed wartime sinking of one submerged submarine by another is singled out for its exceptional difficulty. The attacking crew lacked a fire-control system capable of calculating the underwater solution for them. Their torpedo also lacked the homing capability that could correct its course after launch. Success therefore depended on the crew working out the interception themselves and firing an unguided weapon accurately. The judgment that this was the hardest such attack ever made rests on those technical limitations.
Notable Point · 13:10-14:20
A submerged torpedo attack without modern fire control
A wartime submarine-versus-submarine attack required an underwater firing solution without modern computers or a homing torpedo.