The Bloop – An Unexplained Sound Phenomenon
“The Bloop is the name given to an ultra-low frequency and extremely powerful underwater sound detected by the U.S. National Oceanic and Atmospheric Administration (NOAA) several times during the summer of 1997.”
“While the audio profile of the bloop does resemble that of a living creature, the system identified it as unknown because it was far too loud for that to have been the case: it was several times louder than the loudest known biological sound.
“The source of the sound remains unknown.”
found via soundseller.eu
H.P.Lovecraft would be proud...;)