So I was looking around my home country of South Korea, and stumbled across some air horns on a pole.
https://www.google.com/maps/@36.8158233 ... 312!8i6656
Can anyone confirm that this is, indeed part of some warning system?
A school is closeby, so it might be a school bell?
Edit: I also found another siren.
https://www.google.com/maps/@36.7484744 ... 312!8i6656