I think besides the greater dive depth as SailorSteve already pointed out, the Tench class also carried 28 torpedos instead of 24. However, they really weren't available to the Pacific was in time to have an impact as the Balao and Gato classes had already "gotten the job done".
Cheers!
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Past Hatteras the convoys sail,
It seems the Allies will prevail.
Churchill and Franklin share a grin,
They know who's gonna win this sim.
Finback
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