Place it at the exact moment a character enters a contaminated zone in your edit, then follow it with an error sound for the system warning and finish with dun dun dun as the consequence lands for viewers.
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The Hazmat clip is an 11-second sound effect built around a hazard warning signal, with no speech or music. It gives listeners a tense, urgent feeling, like a safety alert has just gone off and everyone needs to clear the area and take the danger seriously right away.