Post-WWII submarines differed from earlier ones because they were designed to operate underwater most of the time rather than most WWII-era dive boats. The teardrop hull (Pioneered by USS Albacore) is much more hydrodynamic, allowing for greater speed and maneuverability underwater (Along with some other advantages), wheras the WWII-style design was designed to increase performance on the surface much like a normal ship.
At least, I think that's what you're talking about...
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