Citizens in Britain and portions of the Southwestern U.S. have been complaining about a maddening hum that just won't go away. And researchers have been unable to pinpoint its source. Not everyone can hear the low-pitched hum, and those who do say that it seems artificial in nature - and is driving them crazy. In 1977, a British newspaper received nearly 800 letters from people complaining of loss of sleep, irritability, deteriorating health, inability to read or study because of the incessant hum.
Most famous in the U.S. is the Taos Hum. There the annoyance was so acute for the "hearers" in Taos, New Mexico that they banded together in 1993 and petitioned Congress to investigate and help them find the source of the noise. No conclusive causes were discovered. One prevailing theory holds that the hum is created by a military communications system used to contact submarines.
After looking into the possibility of low frequency military communications systems (ELF), I found a few interesting reports that would suggest this is the cause of the maddening hum.
The following summaries were taken from the Department of Energy’s Office of Scientific & Technical Information website.
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Xoom: RE: The Mysterious Hum