I've not witnessed any form of kamikaze attack in-game so far. I'm not aware of any historical kamikaze attack against a submarine but someone can correct me on that if I'm wrong. It may happen in the game but would more than likely be unplanned/unscripted in that sometimes the fighters/bombers attacking a sub 'forget' to pull up in time and thunder in. I'm guessing that in reality a sub is a fairly small target for a suicide air attack and was not a planned target for any kamikaze attacks.
I'm not sure if you realized what you typed in your post:
a kamikaze would not be attacking a u-boat at all given they were on the same side during that particular war.
