I've read of shark, turtle and flying fish being part of the menu. I haven't read of them using hook and line, just using guns. As for only the watch crew topside, I just read of a U-Boat crash diving then realising they were missing a man. He'd been using a temporary wooden toilet they'd put on deck. They surfaced and recovered the man (also shooting at a shark that was circling near him). I suppose a toilet is a good place to be when you hear your boat dive beneath you.
The sound of the diesels vanishing when you look left or right on the bridge is something that happens in an unmodded game as well, so it's a stock issue and one I've never seen a fix for.
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