I’m not going into it but the modern submarine only uses active sonar at very short duration. As for dipping sonar (the most dangerous to submarines), there is defense against active sonar also water bends sound if the temperature is right. You can hide in the water.
I’m not suggesting our subs go active. I know that’s a big no no. But I think we could use a list of other active sonar assets to to force them in to a certain area that’s easier to search.
One more...We know the Swede is quiet. Is our SSN equally quiet to the Swede? If so, that has to scare the hell out of them, especially if they’re being pinged to death.