The chilling sound has caused all kinds of theories in the recent years but many researchers say they have discovered the origin of the mysterious phenomenon known as ‘the sound of the Apocalypse’ or ‘HUM’.
The low-frequency sound has been present in different parts of the world for over 5 years.
The truth about the “hum” is that it is a sound of very low-frequency, about 20 Hertz or 20 vibrations per second, which is within the limits of hearing capabilities for humans. The sound was heard almost by the entire population of Costa Rica in the early hours of January 9, 2012.
Witnesses claimed that the phenomenon lasted five to ten minutes, and while some believe it was caused by an earthquake, scientists confirmed that no such phenomena occurred at that time in Costa Rica or in the vicinity. The entire country was stunned by the sound and it quickly became the most talked about phenomena among researchers and geologists. People started talking about the sign of the end of the world and believed that the sound is prophesied in the Book of Revelation.