Put this clip at the very start of a sequence, before any dialogue or action, then follow the reveal with a dun dun dun beat and finish a chaotic chase moment with a metal pipe clang for contrast.
關於此聲音
This clip is a rising and falling purge siren alarm effect lasting about six seconds, with a loud wailing tone that cycles like an emergency warning. It gives listeners an instant feeling of danger and tension, as if something bad is about to start and everyone needs to move or hide fast.