The 'bloop' is the name given to an ultra-low frequency underwater sound detected by the U.S. National Oceanic and Atmospheric Administration several times during the summer of 1997. The source of the sound remains unknown....

The sound, traced to somewhere around 50° S 100° W (South American southwest coast), was detected repeatedly by the Equatorial Pacific Ocean autonomous hydrophone array, which uses U.S. Navy equipment originally designed to detect Soviet submarines. According to the NOAA , it "rises rapidly in frequency over about one minute and was of sufficient amplitude to be heard on multiple sensors, at a range of over 5,000 km." This means that the sound was detected in 2 different places 5000 km apart! What could be big enough to make a sound that huge?

According to scientists who have studied the phenomenon it matches the audio profile of a living creature but there is no known animal that could have produced the sound. If it is an animal, it would have to be, reportedly, much, much larger than even a Blue Whale, the largest known animal on the earth.

Scientists determined that its wave pattern indicates it was made by an animal, and not a giant electromagnet sucking a plane out of the sky, as the creators of Lost were no doubt hoping.

There is no animal big enough or loud enough to make that kind of noise, not by a long shot. Not a blue whale, not a howler monkey, not even a startled teenage girl.

(Quoted from wiki and

further reading:

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Damn Interesting • The Call of the Bloop

Bloop - Wikipedia, the free encyclopedia

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Also, the wikipedia/NOAA sound has been sped up 16x, this has been slowed 16x to recreate the sound of the animal that made this noise.