AnomalyAlmost the same as the sound of a diesel car idling in the distance. Very intense, yet distant. We were not able to locate it. There is another report very close to the village (Bardo), so this area might be a hotspot. This is the only area outside of a city in Bulgaria with 2 reports being that close to each other.
Bulgaria, Bardo (village) · 2018-05-10 · from the WORLDHUMMAP archive
An account in Bulgaria, Bardo (village)
What they reported
First noticed: 2014
Pitch: 30 hertz; Sine; at maximum volume
Loudest: During the night
Where: Indoors
Symptoms: Ear discomfort (pain, fullness, throbbing);Sense of vibration;Anxiety
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.