My money was on a troll city.
The mystery of the Bristol Hum has been solved
French scientists believe they may have solved the mystery of the Bristol Hum that has baffled hundreds across the city for more than three decades and which many have claimed it to be nothing more than a myth But for those who were kept awake at night by the Bristol Hum, it was very real.
French researchers at Centre National de la Recherche Scientifique have offered an explanation of what could have been causing the low droning that has plagued some Bristolians for all these years – and it’s not wind turbines, power lines, or even UFOs, as suggested over the years.
Scientists have, until now, been baffled by the Bristol Hum and other similar reported phenomena across the world, from Largs in Scotland to Taos, New Mexico which only two per cent of people can hear.
But French scientist Fabrice Ardhuin believes it is the pressure of the waves on the seafloor generating seismic waves which cause the Earth to oscillate for between 13 to 300 seconds.
"We have made a big step in explaining this mysterious signal and where it is coming from and what is the mechanism," Ardhuin said of the study, which was published in Geophysical Research Letters, a journal of the American Geophysical Union.
The Bristol Hum was first reported in the 1970s by around 80 people living in different parts of the city. The sound was reported to be heard in Cotham, Redland, Clifton, Westbury-on-Trym and Avonmouth.
There have been many claims over the years suggesting what could have caused the hum but despite the different ideas, sufferers have identified common factors – the humming is only heard indoors, it is a low, rumbling noise, it is louder at night, and is more common in more rural areas.
Doctors blamed patients’ abilities to hear it on tinnitus, until Addenbrooke’s Hospital in Cambridge had confirmed sometime in the 1990s that the cause was external.
Dr Baguley’s own theory was that many sufferers’ hearing has become over-sensitive.
He said people have an "internal volume control" that helps them amplify quiet sounds in times of threat, danger or intense concentration