The sound originates in Among Us, the social deduction game developed by Innersloth and released in 2018, which surged in popularity in 2020. The reactor meltdown is a critical sabotage the imposter can trigger, forcing crewmates to fix it together before the timer expires. Clips of the alarm spread through gameplay videos, streams and meme edits, separate from the game itself. Its urgent looping siren became shorthand online for emergencies, suspicion and things spiralling out of control, so creators still reuse it whenever a situation needs instant pressure.