Ok decided to keep Stiebler original idea (thanks DieselGlock), so we can't repair bow/stern planes, fuel tank, torpedo tubes, rudders, propellers while submerged. So forget about previous file...
But here is the typo fix for type II in basic file.
It was very small error, that the game seemed to ignore anyway...but who knows...better to have correct file.
https://www.mediafire.com/file/1q00x...po_Fix.7z/file
It will be included in next update anyway.
