when looking at torpedo not exploding issues dont forget:
if the angle is steep you can glance off the ship without detonating which looks like a dud but you just have too sharp an angle to strike the firing pin and the torpedo stops and sinks away. (in real life it should glance off and keep going)
also i have seen if the prop hits the side of the torp before the head hits the ship you get the same non explosion and the torpedo stops and sinks away
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