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Originally Posted by Castout
Look at WWII type torpedo fuse: magnetic and impact.
I bet there's no magnetic field generated by a countermeasure and obviously impact fuse won't detonate either. If topedo does explode on countermeasure why does Oliver Hazard Perry class employ a nixie topedo decoy? The safest would be to throw lots of CMs and the threat torps would explode on them.
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Actually, the Nixie also has a decoying advantage in that it moves, so it can trick a torpedo smart enough to actually measure (via Doppler generally) whether the target is moving. It is also moving in the same general direction of the intended target, so even if the sub is wire-steering, it might not be able to figure it out at once.
But I agree with you on the larger points. Large decoys like the Russian MG-74 or the American MOSS (is MOSS a Technothriller-creation or does it exist?) and Nixie probably have room for electromagnetics that can generate a field to explode a torpedo and so could do it. The smaller bubble generators and noisemakers that the game seems to be simulating almost certainly don't have that facility. Even if the torpedo hit the little canister head on, it shouldn't detonate the fuse unless it is so sensitive the question becomes why didn't it explode against some stray ocean current.
On the other hand, you might note that in DW, we have no choice whether to use a bubble generator or a MG-74.