"In summer 1997, the U. S. National Oceanic and Atmospheric Administration’s autonomous hydrophone array in the Equatorial Pacific Ocean repeatedly recorded a peculiar sound of a nature suggesting a biological origia. Yet, the sound’s amplitude was too large to be produced by any known animal species, and its source remains a mystery. According to NOAA, the readings yield a general location of the sound’s source “near 50° S 100° W”. The sound was given the name “Bloop”."