When the announcement of the Victoria Class submarine was announced, I did think it was a pretty smart purchase. The Upholder was a nifty fusion, attempting to combine ultra modern sensors and quieting normally found on a SSN on a SSK. Unfortnately Canada did a awful job when they took possession of them.
You're 15 to 20 year estimate is wildly optimistic. Even DND estimates with the life extension program pegs their end of life at the start of 2030 to mid 2030's. By that point they won't be upgradible, will be woefully outclassed, and will be worn down, which with submarines is dangerous.
Its similar to buying obsolete fighters from Australia.
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My name is Ozymandias, King of Kings;
Look on my Works, ye Mighty, and despair!
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