Propulsion and fuel efficiency is a big one, also enhanced quieting. With the newer generation SSNS and I think SSK (Diesel) is that they have next generation sonar and attack systems and are extremely quiet. So upgrading the Victoria's fire control and Sonar Suite though the BQQ-10 is really good, they could still be at a disadvantage.
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My name is Ozymandias, King of Kings;
Look on my Works, ye Mighty, and despair!
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