Anomalymonotone and changing (once in 5-7 seconds) its frequency sound. Not changing while I turn my head, not possible to find out the source or direction in which it might be I think that in Saint-Petersburg the source of sound may be water pump in the basement, but what makes sound at the village (separate 2-storey house)baffles me most of all
Russia, Saint-Petersburg · 2019-03-13 · from the WORLDHUMMAP archive
An account in Russia, Saint-Petersburg
What they reported
First noticed: 2002
Loudest: During the night
Where: Indoors
Changes with weather: no
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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.