Many of people in Mexico have reported strange sounds. Mostly people blame their experiences with these phenomena on Sirins, but others simply report strange sounds. Some believers claim it means the starting of the apocalypse, and skeptics say it's just the tectonic plates shifting. So It has been reported since the 1990s and the most recent sighting was in 2006. The most popular sighting, however, was when almost everybody in Guatemala claimed to hear the mysterious sound.