Some residents of Windsor, Canada, have been disturbed by a mysterious low-frequency sound at night. The sound sometimes lasts for hours, but sometimes for days. Photo: Amusingplanet.

Not everyone in Windsor has heard the mysterious sound. Dubbed the Windsor Hum, some residents have heard it in their homes and at night. Photo: Jon McCormack.

Some people who have heard the Windsor Hum have described the mysterious sound as sounding like a diesel engine from a vehicle or as a continuous rumble of thunder in the distance. Photo: Strange Sounds.

Hearing the mysterious Windsor Hum has caused some people to feel nauseous, have headaches, and have trouble sleeping. Photo: Low Frequency Hum Sufferers/Facebook.

Authorities and experts have launched an investigation to clarify the cause of the mysterious sound that affects people's lives and health. Photo: Alamy.

Despite using many modern devices, experts have not been able to decipher the mystery of the ghostly Windsor Hum sound. Photo: Glow Images/Newscom/File.

Several theories have been put forward regarding this incident. One conspiracy theory suggests that aliens or UFOs are the "culprits" responsible for the mysterious Windsor Hum sound. Photo: the-spring.com.

Another theory suggests that the nearby steel mill could be the source of the mysterious noises that keep some people up at night. Photo: principia.es.

Mysterious geological activity deep underground is also believed to be the source of the Windsor Hum. However, researchers have yet to find a definitive explanation for this. Photo: Roman Samborskyi / Shutterstock.

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