Sonar Training Record Series D16:
These are declassified training recordings of USN submarines on an early radio sonobuoy system. These were provided by NUWC Newport.

Introduction, small submarine propulsion with little background noise.
Approaching and leaving small submarine with little background noise.
Larger submarine.
Circling submarine with both motor and propeller sounds. Explosions in the background.
Small submarine above with some background noise.
Small submarine with some background noise and surface naval vessel.
Large submarine with some background freighter noise.
Old type submarine with realistic noise from the sonobouy gear on a quiet day.
Large submarine with more sonobouy noise.
Samples from the sonobouy with overloading when close, and of submarine moving towards and away from hydrophone.
Submarine moving towards hydrophone.
Practice sounds.
More practice determining if the submarine is moving towards or away from the sonobouy.
Sounds *other than* the propulsion.
More sounds *other than* propulsion created aboard USS Blackfish, and other non-submarine sounds.
Practice sounds. Note that the prefix to the first sound at the very beginning is missing.
Practice sounds continued.