Subject: Re: WHY does Israel have to wait for
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/b...

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