Whistle (unidentified sound)

As a Whistle (English: whistle ) noise is referred to, which was recorded by a single hydrophone in the Pacific Ocean on 7 July 1997 at 7:30 GMT clock and recorded. The location of the hydrophone is 8 ° N, 110 ° W8 - 110. The origin of the noise is unknown, and it has been registered by any other hydrophone. Its frequency range was 1-6 Hz

The National Oceanic and Atmospheric Administration suspected as the cause of the noise a submarine eruption.