I think its also worth noting that both sides during the war, probably from around mod 1941 onwards were both well aware of the fact that ASDIC was ineffective if the target got under a thermocline and one of the main reasons the germans did not develop an effective bathythermograph was that in the Atlantic the thermocline was usually below 500ft-600ft, well below the diving capabilit of most uboats. In the Pacific the layer could sometimes be found within 200ft of the surface.
One thing that annoys the crap out of me is the accuracy of allied sonar/ASDIC when detecting my uboat when I'm in the middle of a convoy going at some speed. In RL under these circumstances they hydrophones are next to useless and even an acitve ping will be very lucky to locate a shallow submarine in amongst all the hull movements in the convoy. Then the escorts come charging in and dropping DC's in amongst the convoy lines. Something a RL DD commander would turn pale at.
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