If your torpedo does not detonate on impact, here are the reasons:
1) Dud torpedo (assuming you have this turned on)
2) Too steep an impact on the hull of the ship. This can happen in two axis - to steep an angle relative to the surface of the water, or too steep an angle by striking too deep on the hull of the ship.
3) Too close for torpedo to arm (about 300m).
Magnetic torpedoes will not detonate if they pass too deep under the ship, or if they are duds. Chances of magnetic duds increases greatly at ranges over 1000m.
Steve
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