From damage report, both your propeller shafts (antriebswelle) are damaged. Repairable (otherwise they would be highlighted red instead of orange), but still not operational - try to wait until crew fixes them (you probably will have to be surfaced for repairs to continue).
Edit: also, make sure your crew are not on battle stations, silent running or whatever other emergency state - some of these pause repairs in order to prioritize other activities.
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