The dive planes in the external and internal (guages) views are all out of whack. The bow planes should point up (forcing the bow down) and the stern planes point down only when the sub is starting to dive. They should then level off, or the angle will continue to increase until the boat is upside-down (not a good thing). When the boat nears the assigned depth the planes should then reverse, causing the sub to level off. Of course this can be modified for different dive/surface angles and speeds. Just listen to the Chief's various commands in Das Boot: "Bow down ten, stern up ten"; "bow down fifteen, stern down five" etc.
Amazingly, Silent Hunter II got this right. Their external and dive guages views show the planes moving to start and stop the dives.
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