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  Monitoring the global ocean through underwater acoustics
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  "Train"  
 

"train" spectrogramThis sound was recorded on March 5, 1997 on the Equatorial Pacific Ocean autonomous hydrophone array. The sound rises to a quasi-steady frequency. The origin of the sound is unknown.   

Click on spectrogram for full-sized image.

bloop sound586K wav file(The recorded signal has been sped up 16 times) 

 
     
 
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