In SH1 you could sink the Japanese Imperial Navy several times over. The system randomly generated warships and didn't track for the individual loss of named units so you might end up sinking several Akagi-class carriers during your career although there was only one in the IJN.
I do seem to recall that barring really foolish tactics you were pretty hard to beat after you got a Gato boat under your feet with a full sensor suite and better torpedoes. You cetainly never had to sweat aircraft like the Germans did in the Atlantic.
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--Mobilis in Mobili--
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