Place it after the radio call for help and before the rescue team enters, then follow it with heavy breathing and radio chatter sounds to keep the focus on the search effort inside the building.
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This clip is the full alert sequence from a Totmannmelder, the personal safety device on a breathing apparatus set, with electronic beeps that accelerate and grow more insistent over about thirty seconds. It feels tense and urgent, creating an immediate sense of emergency. It comes from German fire brigade equipment, including MSA units worn when firefighters enter smoke-filled buildings.