Spectrogram of the Whistle sound
The Whistle, from the NOAA
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The Whistle is an unidentified sound recorded by the autonomous hydrophone deployed at a location in the Pacific Ocean with coordinates 8°N 110°W / 8°N 110°WCoordinates: 8°N 110°W / 8°N 110°W. It was recorded on July 7, 1997. The origin of the signal is unknown, and it was not detected on any other hydrophone. The band of energy between 1 and 6 Hz represents strumming of the mooring in mid-water currents.
Some of the other significant unexplained sounds named by NOAA along with Whistle are Bloop, Julia, Slow Down, Train and Upsweep.