What sounds do sonar technicians hear in a submarine? - Quora
sonar sound effect - YouTube
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
Sonar Pings Sound Effects Text Tones and Ringtones by Text Tones and Ringtones on TIDAL