I think it varies with the time in the war (they got a lot better later in the war), and on the skill level of the crew (I believe it works in a similar fashion to your crew skill level), so sometimes they'll be on you like a fly on pooh, other times you'll be able to surface and shoot them at leisure with your deck gun. In fact yesterday I had one destroyer scraping the paint off the side of my sub, while I waved at the crew and shot them, and then another in the distance shining it's light on me but not doing anything else, so the game seems to be a bit hit and miss with AI ATM. Hopefully it'll be improved with 1.3.
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