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Watching TV shows or movies that display Russia as a military superpower is almost surreal nowadays.
(self.showerthoughts)
A "Showerthought" is a simple term used to describe the thoughts that pop into your head while you're doing everyday things like taking a shower, driving, or just daydreaming. A showerthought should offer a unique perspective on an ordinary part of life.
Old diesel subs? Sure.
But back in 2005 a now thirty year old Gotland-class diesel sub embarassed the USS Reagan in war games.
Since then, plenty of countries have designed newer and better diesel subs, and battery tech has obviously improved.
There's a massive difference between an acoustically-optimized, AIP-capable Swedish submarine built thirty years ago, and what the North Koreans have which is basically none of those.
Also, while the Reagan itself was pretty new at the time, the Nimitz class was already a 30-year old design when that war game happened, and is now almost 60 years old as a class.