I fired a salvo into a convoy the other day, one was defo on target and the other 3 went into the pack. Now the one on target struck at a near right angle and just BOING bounced of the side "okay a dud they do exist, no problem ! the other 3 check them" I thought, and to my astonishment they all stopped shortly after the first dud struck and sank to the bottom. All torps set to piston fire range at fire was 1k min and all 4 were dud's.

was my reaction, then the DD's came to see what all the fuss was about
So my first experience of dud's was a salvo fire and it was all 4 lol