Sonar has to hit something and bounce back. Detecting sonar doesn’t. No hand waving needed. When transiting places like that, there is either an escort, or t

Sonar has to hit something and bounce back. Detecting sonar doesn’t. No hand waving needed. When transiting places like that, there is either an escort, or the sub is surfaced, or the sub moves reaaally carefully. All depends on the mission. Check out the book “Blind Man’s Bluff” for more info.