Residents of Woodland, Country Durham, England, have been complaining of a low hum that lasts between midnight and 4 a.m. every night.
Residents of a tiny English village have been kept awake for the past two months by a persistent low hum, which arrives every night at midnight and goes until 4 a.m., and nobody knows what causes it.
People in Woodland, County Durham, variously describe the sound as a throbbing, a buzzing, and a droning – all occurring just at the edge of perception. Many have likened it to the sound of an idling diesel engine.
"In certain areas of the house you can hear it more loudly. It is definitely from outside, it's in the air, all around, very faint," Woodland resident Marylin Grech told the The Telegraph's Richard Alleyne.
Not everyone can hear it. The BBC reports that most of the complainants are between 50 and 60 years old.
The Durham Hum, as it has become known, is not the world's first unexplained low frequency rumble. In the 1970s, thousands of people in Bristol, England, complained of a deep throbbing sound. Nobody ever discovered the the source, and one day the Bristol Hum simply stopped.