Post #24156 by onepoorguy on the US Policy board

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I was referring to the boat-class, not the specific engine. Yes, a diesel engine is noisy. When operating on batteries, a diesel sub is pretty quiet. Especially more modern ones (I'm not talking WWII-era subs). You are correct that they need to charge their batteries. But you are not correct that they are not a threat. The boats are generally smaller, and disturb the water less, making less noise.

https://nationalinterest.org/blog/buzz/war-games-s...

Yet despite making multiple attacks runs on the Reagan, the Gotland was never detected.

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