Every two or three years, mysterious signals arise from the depths of the ocean
The detection system of American submarines recorded a pulsating signal at a depth of 8 kilometers, in the Pacific Ocean, where there are no nearby islands. Starting to check the data in the archives to identify the source, the military discovered that such signals had already been recorded in the past, and that the first was recorded 54 years ago.
The information stored in the archival documents mentions several cases of reception of abnormal signals coming from great depths. But none of them could be explained.
In 1977, a radio operator aboard a ship in the middle of the Atlantic Ocean received a strange signal from a depth of 8 kilometers.
It appears from the documents that the military conducted studies of the ocean floor in this area after receiving acoustic anomalies, but the results of these studies have not been published.
In 1991, the United States Navy discovered two unknown acoustic signals, called Upsweep and Whistle, which came from great depths. Upsweep is an unidentified sound detected by the U.S. National Oceanic and Atmospheric Administration’s Equatorial Autonomous Hydrophone Arrays.
This sound was present when the Pacific Marine Environmental Laboratory began recording its SOSUS sound monitoring system in August 1991. It is a long train of narrowband rising sounds lasting several seconds each. The source level is high enough to be recorded throughout the Pacific.
The Upsweep signal has been observed in the spring and fall for several years, and its point of origin has been located somewhere in the Pacific Ocean.
Six years later, in 1997, the United States National Oceanic Administration received and recorded an underwater signal sent from a point near Antarctica. It was not possible to decipher and trace the Bloop, the name given to this signal.