I think it depends on the sub model. I might be wrong, but my understanding is all the US fleet boats were welded and only the newest German boats were welded, otherwise mosty rivets. Internal seal quality and maintenance is also a big factor. The deeper you are when you take the hit places more stress on the hull. All in all, I wonder if it matters? You learn what the game will take in SH3 and 4 and work with it.
-Pv-
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