That stereotypical active sonar sound - where did it come from? : r/submarines
Is it true that sonar only reveals where the submarine being detected is a few seconds before because the speed of sound is slow? - Quora
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