Someone will have to help me with the actual file name but (IIRC) you can change the default crash depth in the cfg file which also governs the storm conditions for your flak/deck gun. I can't for the life of me remember what it's called atm.
Edit - found the file path - ...\SilentHunterIII\data\Submarine\NSS_Uboatxx\NSS_Uboatxx.cfg
You'll need to change the crash depth setting for your current boat. (be safe, in port, SH3Cmdr rollback etc)
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