What I find helps most is, if you can launch without them hearing the transient, to guide your fish in at an extreme angle. What I do is I get good solution on a contact, then pop above/below the layer (whichever side they're not on) and turn parallel to them to fire a torpedo from the side facing away (they seem to hear that less often, maybe it's just my imagination). Then I let the torpedo run parallel to their course and, only when it's a good distance away from me do I adjust course for an intercept. When they finally hear the torpedo, they will fire down its bearing and you'll be sitting comfortably faaar away.
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