7th
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. According to scientists who have studied the phenomenon it matches the audio profile of a living creature but it would reportedly have to be several times the size of the largest known animal on Earth. 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. (via @devijvers)