They were probably duds.

I've read (can't recall where) that the rough chance for a torpedo to dud is somewhere around 20-30%. Now, supposing it's as high as 30% the chance for all four to dud is less than 1%, and I have seen a glitch where certain players will see four or more of their torpedoes all go under their target frequently.

Worth noting is that KM torpedoes will detonate if they are close misses, so even if they "dud" they will have another chance to score a proximity hit behind the target. This makes their effective dud rate much lower than IJN, for example.

It's closer to 40% chance of duds, but otherwise, what he said.

Which is why everyone and their dog plays KM SS.

40% dud rate? today i was in my UK R type and fired 14 torps it it (6 front/2 rear/6 front) and 12 were dud 'go unders' . 2 exploded on contact and 4 caused minor damage after going under and exploding at max range.

then i run out of air and got owned.

isnt "going under" caused by firing to close by your target?

your sub is under the water if you fire, the torps arent imidiatly at the target ships depth

i look at it as a 2nd arming range (never really bothers me cos i play a VIIC atm)

If they didn't have that neat little "dud" feature, then there would be howls of protest about overpowered subs.