AnomalyI sincerely apologize for the inconvenience, but I do not know English and I use Google Translate to send this information. I live in Hanoi, Vietnam. When I came across two rivers in Hanoi (Red River and Duong River) I had heard several times that it sounded like someone was singing again and like u-lingering sounds like metal. My friends all didn't hear that noise, and it ended when I left the area.
Chương Dương Bridge, Hanoi · 2020-01-05 · from the WORLDHUMMAP archive
An account in Chương Dương Bridge, Hanoi
What they reported
First noticed: 2013
Pitch: It fluctuates up and down from 100-155Hz, in the sine pattern
Loudest: Equal night and day
Where: Equal indoors and outdoors
Symptoms: Ear discomfort (pain, fullness, throbbing), Sense of vibration
Changes with weather: no, although not every day can hear them but the days I hear are almost no rain, 4 times with very small rain, 1 times with moderate rain.
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This is a Hum report from Dr Glen MacPherson's World Hum Map, an open, worldwide record of people who hear an unexplained low-frequency hum. Reproduced with permission and with thanks; the project is at thehum.info. We remove anything on request. Location shown is approximate.