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This is an Oberon class submarine. I’m a little fuzzy on the dates but it served for 33 years, from the 1960s to the late 1990s. It was primarily a Cold War submarine.
It’s a British design and build, it was replaced with the Victoria class subs.
Typically subs last about 15 years. From what I was told parts and maintenance are the reason for this. As far as this sub, it was at the point where the whole thing needed to be refitted to keep it seaworthy, it was terribly outdated.