What is this sound from offshore Peru? I recorded this sound offshore Peru and called it the “pacman” sound for obvious reasons. This was recorded from a towed hydrophone array from a large scale shipboard survey and only heard for a few minutes. We conducted sparse transects through this region for several years and surveyed throughout the Eastern Tropical Pacific for >5 years and I have never heard this sound outside of this one encounter.
Does anyone know what this is? Audio available on Soundcloud and spectrogram provided: