The search cone is indeed wide enough such that depth is not an issue at all, provided the torpedo enables far enough away (which wouldn't be that far. I think the only way depth would help is if the torpedo is enabling just a few dozen yards away from you and there's quite some vertical separation). Any game where it's easy to avoid a search cone by changing depth is doing it for gameplay purposes. You do however want to change depth as you're doing hard rudders in your evasive maneuvers, anything to try and out turn the torpedo at the last second (advice for the very last ditch effort part of torpedo evasion lol).
In terms of depth, no there isn't really a way to do that in real life (unless you're very close to them perhaps, forget it at 10k yards) and it's not possible in Dangerous Waters besides "is it above or below the layer?"
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