The Windsor Hum

The Windsor hum was first noted in 2011, when locals in the Canadian city of Windsor in the province of Ontario suddenly began to hear a persistent, almost audible hum. Since then, a variety of theories have been put out to explain it by both professional scientists and conspiracy theorists, but with little success.

The mystery persisted until the Covid epidemic drove several manufacturers throughout the US to halt production in April 2020. A US Steel plant was among them, and it was situated on Zug Island in Detroit, just across the river from Windsor. It turns out that the hum was caused by the plant's overworked blast furnaces, which in turn caused the metallic foundation to shake and create a persistent, low-frequency hum that is difficult to hear. When the furnaces were turned off, the noise stopped.