None of the AI boats go from surfaced to submerged, no trigger to make them do so.
I did try the US fleetboat and it does keep speed on the surface, even shoots it's deck gun, just has no crew and needs zones added. It got in a running gun battle with Bungo Pete and won.
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You see my dog don't like people laughing. He gets the crazy idea you're laughing at him. Now if you apologize like I know you're going to, I might convince him that you really didn't mean it.
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