I would think it would be damn near impossible to successfully engage anything other than a stationary target with a deep-launched torpedo, with WW2 era equipment. The acoustic torpedos improved the odds somewhat, but I would not expect a deep launch with a Mk14, for example, to achieve any reasonable chance of success.
I was under the impression that sub-to-sub combat was virtually impossible in World War 2 because they did not have a means of getting a targeting solution at anything under periscope depth.
Also, wouldn't opening the tube doors at 400 feet be a bad thing? I'm not sure if torpedos have a recorded crush depth, but I would think that the interior of a tube would be much more susceptible to the pressure.
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