@Weisia:
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I am playing almost for a month the NYGM expansion and one thing I really had to get used to was that my boat would sink when I turned my engines off (while being submerged).
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No sane submarine commander would have his boat trimmed up when making a periscope attack on a defended target. Suppose the boat broaches (rises from) the water suddenly? The boat will be spotted at once and attacked. Also the firing of torpedoes will make the boat suddenly lighter, so it is more likely to broach. Of course you must be trimmed down, tending to sink, when you make a torpedo attack.
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Doing silent running on the lowest speed is of course the solution. But for several patrols I encountered now the problem that my sub will only keep the ordered depth when doing 'halbe fahrt'. As soon as I turn my speed down the sub starts do dive again. Attacking convoys and evading DD's is quite difficult when my screws are screaming for attention.
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This is an example of the famous, or infamous, 'crash-dive blues'. In SH3, owing to a bug, a crash-dive causes the U-boat to sink stern-first until it levels out at its pre-set crash-dive depth (usually 80 metres in NYGM). If you *interrupt* the crash-dive before it is complete, for example by setting a deeper depth before the crash-dive is complete, the boat will never level out. Then you will have trouble controlling the boat at its new depth, except by moving at half-speed.
These are the solutions:
1. Do not crash-dive, unless it is essential for the fastest possible dive. Instead, dive at flank speed on the dive planes (key 'D').
2. If you must crash-dive, allow the crash-dive to level out at 80 metres (20 metres for type II boats) before using the 'D' key to go deeper.
3. If you crash-dive, then accidentally set a new depth, causing the 'crash-dive blues', return as soon as you can to a depth *above* the crash depth (for example, to 70 metres), then crash-dive again and allow the boat to level out at 80 metres. Then the problem ends.
The 'crash-dive blues' affects all versions of SH3, with all mods, but it is especially a problem with NYGM because the boat is always trimmed down.
Stiebler.