When a submarine is detected on sonar from a surface ship, do they actually hear the pinging sound or is that a Hollywood thing? - Quora
Sonar Beep Sound Effect | Orange Free Sounds
Beam Reach | Tag Archive | sonar
Freesound - "submarine sonar.mp3" by Link-Boy
What does a submarine active sonar really sound like? I've found a recording from the USS Caiman (BQS4), but I've read that real (modern) active submarine sonar sounds like a multitone range