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Originally Posted by _Seth_
Could such failures be fixed during the patrol (divers, maybe?), or did they always have to go to a port with repair facilities? I know that during such repairs in Norway in WWII, German uboats used to flood their forward tanks. Together with the help af a small crane, the repair crew could lift the stern above water (Not much, but enough) to let a small boat get in under the screws to fix them. This saved a lot of time, since the boats didnt have to go to ports that had dry docks.
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A Damaged prop would have to be replaced, or at least removed for repair in a machine shop.
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I can imagine the terror if a uboat had to dive to escape enemy DD's, knowing it had a broken screw that was making noise...
*"Yes, men, we are diving to get away from them..But they will find us anyway.."*
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One account I read said that the destroyer that sank Gunther Prien's U-47 tracked them by the noise from a damaged propeller.