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Re:Veteran submariner on how sonar crews tirelessly hunt ene... by GCPGCP on Wednesday August 12, 2020 @11:38PM (#24139734)
This is what you can expect https://www.youtube.com/watch?v=sCmyZYYR7_s&t=90s

This diver was near a sub base for training.

Re:Veteran submariner on how sonar crews tirelessly hunt ene... by MrBuddyCasino on Thursday August 13, 2020 @09:34AM (#24143159)
Comments say this was very likely not a sub‘s sonar.