Subs in real life did not like having their pressure hull punctured. Even if you tried to fix it with shoring, temporary welds ,etc. there is no way you could expect to be back to brand-spankin-just-out-of-drydock new.
You get hit, you are going to suffer. The secret is not to get hit and if you do, adjust patrol acordingly. You may have to run to port on the surface and hope you can fix it enough to go to periscope depth to avoid planes.
That said, the damage may need to be twiddled with. :hmm:
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U-46: Oct 1943 off Portugal
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