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bloop spectrogramClick on spectrogram for full-sized image.

1.27MB wav file(The recorded signal has been sped up 10 times) 

  Small boat passing over hydrophone  

This spectrogram shows the result of having a vessel pass very near an underwater hydrophone, overwhelming all other sounds and saturating the hydrophone recording. The relatively high frequency of the noise indicates a smaller vessel, perhaps a fishing boat or pleasure craft, in the immediate vicinity.