For decades people having been reporting a mysterious Hum from all corners of the Earth. Dozen of News stories have been written and produced on the subject. Speculation as to the possible origin of this noise has covered topics such as UFO's, ocean waves and even the suggestion that the Hum is only imagined and doesn't exist at all.  

Admittedly the world is a noisy place and in fact there are undoubtedly numerous sources of low frequency noise. Wherever there is Industry there is a potential to emit low frequency noise. Machines and devices that move and rotate, pipelines and many other things in our modern world create noise. Often the exact source of this noise can be difficult if not impossible to pinpoint or sort out from the other background noises. This is also true of sounds related to the Hum since it is generally considered to be low frequency noise.