Bloop (in translation from English. A low-frequency sound recorded several times by the US National Ocean and Atmospheric Administration (NOAA) in the summer of 1997. The source of sound remains unknown.

The source of sound should be located approximately at the geographical coordinates of 50°00′00″ y. 100°00′00″ d. (G) southwest of South America The general nature of the sound makes it possible to suspect that it was delivered by a living being, but such a being is unknown to science. Judging by the distance passed by the sound, this creature must be of enormous size, much larger than a blue whale.

If we reject the assumption of the existence in the Pacific Ocean of an unknown to science species of giant beings, there are two versions: either the sound is produced by a large number of beings at the same time, or in this region for a short time developed unique acoustic conditions that allowed the distant distribution of sound.

It is not uninteresting that the coordinates of the sound source are near that place 47°09′ south. 126°43′ p. d. (G), which Howard Lovecraft indicated for the underwater town of R'Leeh, in which Kthulhu sleeps.

However, considering the information not too important, a detailed study with deep immersion did not produce.