If I had to conjecture, I would put it down to one of the following... 1. they can see your periscope. or 2. they can actually see your sub.
This happened to me once in a fleet boat while attacking a Japanese task force, on a clear clear day if you are close enough to the surface they will attack you because they can see your conning tower/deck plates. I had the Japanese escorts machine gunning into the water to try and get me. I kid you not.
SH4 appears to have an allowance to spot you while at shallow depth, something SH3 does not have.
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I SURVIVED THE FIRST EVER SUBSIM WEREWOLF HUNT - and... I actually won the game for the humans too!
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