Supposedly that's no longer something to worry about in the open ocean with the advent of towed arrays, but not for older subs or in littorals, where TAs may not as useful. Still, most modern subs would just stream TAs in open oceans, wouldn't they?
Just a sidenote.
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Vanvikan, Feb. 2009: ordinary human, KIA, night 4
HMS Thanatus, May 2009: ??? human, KIA, night 7
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