Thanks for he replies. I shall investigate more.

I am just wondering if it is intentional that subs running in silent mode are surprised by carriers and battleships?

<t> Shouldn't the Atlantic Wall artillery fire on ships that stop next to them? British ships are able to park next to the guns and attack the adjacent infantry. I should think they should at least provide a defense fire like the normal artillery. It's rather annoying to a ship pull up, do shore ...

Same here. Happens randomly during game.