Unresolved Deep Sea Sounds: The Bloop & Slow Down

  • Uploaded by -Marduk- on Jan 13, 2009
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In the summer of 1997 a large number of sound recordings made by the NOAA came in. The source of those sounds could not be traced to its origin. One of these sounds, the Bloop, was heard over 5000 km away. Scientists speculate that an animal caused the sounds, however, given the radius, it must be larger than the blue whale, the largest animal on Earth (for those of you who don't know).

Yet, these sounds are peculiar for the fact that one of them is positioned at 50°S 100°W, which surprisingly is near Lovecraft's mythological city of R'lyeh, where Cthulhu awaits.

And one other thing is the fact that both sounds on this video have been recorded at 15°S 115°W and 50°S 100°W respectively. If you look them up on maps, you'll notice that they're relatively close. Also, both the numbers are integers, could be coincidence or something else...

The first sound is called Slow Down and the second one Bloop.

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 description, 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." 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 larger than even a Blue Whale, the largest known animal on the earth.

In popular culture

* Because the Bloop noise originated near the location of the fictional sunken city of R'lyeh from H. P. Lovecraft's story "The Call of Cthulhu", the Bloop has been linked to Cthulhu by Lovecraft fans.
* In the alternate reality game promoting the movie, the Bloop was also linked to the monster from Cloverfield
* The Bloop was seen in The Loch by Steve Alten as the call of an undiscovered species of giant eel, as well as in Frank Schätzing's novel The Swarm as the speech of the intelligent species, the Yrr.

The Slow Down is a sound recorded on May 19, 1997, in the Equatorial Pacific ocean by the U.S. National Oceanic and Atmospheric Administration. The source of the sound remains unknown.


The name was given because the sound slowly decreases in frequency over about 7 minutes. The sound was detected at 15°S 115°W / -15, -115. It was recorded using an autonomous hydrophone array.

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