Place it at the very start of an evacuation scene, before any dialogue, so the warning sets the scene for everything after it. Follow it with a Vine Boom Sound for the reveal, then a Dun Dun Dun for the awkward pause that follows.
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This clip is a repeating high-pitched fire alarm beep that sounds in short, sharp bursts for about eleven seconds. It carries an urgent, tense feeling that makes a room feel like an evacuation is starting, even when everyone knows it is only a sound. The steady pattern keeps the pressure up from the first beep to the last.