AnomalyDiesel Moor Idling in the distance i have been working in marketing and social work, i am not a scientist, but i am 100 % sure the sound is external not internal, it must be related to the power grid, or the 4G and 5G cell phone stations, another possibility i suggest, are pipes that vibrate to a certain frequency
10117 Berlin · 2018-11-23 · from the WORLDHUMMAP archive
An account in 10117 Berlin
What they reported
First noticed: 2018
Pitch: 45
Loudest: During the night
Where: Indoors
Symptoms: Insomnia, Sense of vibration
Changes with weather: Not sure
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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.