EUAnon here
Strange sounds coming from the sky.
Sounds like some sort of high frequency laser or sth.
Hard to describe, sometimes the frequency is getting higher, sometimes the noise is getting louder and lower again. Very strange and have never heard anything similar before.
It's less like the TV is on next door.
It's like the sound an turbine does at 30k rpm.
No such sound you'd expect to be normal, as I said I have never heard something like that before.
Just got confirmation that it had also been close to the border of Netherlands aswell. Really curious rn