Since 1.03 (AFAIK) torpedoes are reported (Torpedo in the water, or TIW call) when they are detected on sonar. So if you mask the sound, the torpedo won't be reported and even AI will not react.
Layer can do that. But only when sound crosses it at shallow angle. Which usually means when the sound source (torpedo) is far away. Target ship will detect it sooner or later. You cannot mask it completely. I doubt you could get it closer then 5 nm without TIW. But it really depends a lot on conditions and nobody really knows exact numbers.
But sure this can help you. The target ship will have less time to get away. Torpedo at 5nm is really a problem. And also you will have more time to change your location, because most players (human and AI alike) will send some fish at the TIW bearing.
Active or passive should make no difference. When torpedo activates it should be close enough anyway. If the target is moving toward you, you can try slow torpedo. At large depth (which is usually the case if you want to send it under layer) it can run even without cavitation. You can then move slowly above the layer and watch for target's movement. You'll know when he detects the torpedo. He will at least drop CM and in most cases he'll flank away. In that moment remote-activate the torpedo, there is no need for it to run slow anymore.
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