@Justaman:
Your problem seems like an extreme example of the 'Crash-dive blues'. If you make a crash-dive, and then interrupt the dive (eg, by levelling off) before reaching 80 metres, the U-boat will continue to sink. The problem is that the U-boat has not settled to an even keel, as it should, and the only long-term solution is to return to the surface and crash-dive again.
If you crash-dive, allow the U-boat to settle off at 80 metres before diving deeper. Use a crash-dive if attacked by aircraft, when you can level off safely at 80m. Otherwise, dive deep without a crash-dive.
Stiebler.
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