this post was submitted on 11 Sep 2023
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Those PASS devices sound like a really creepy cricket noise almost when they chirp together but out of phase from each other.
It’s a sound that permeates much of the post-collapse footage; when a much younger and less experienced me first heard it, I thought it was car alarms - I didn’t connect it with the fate of hundreds of fire crew.
Here’s another clip that captures the “chirping”.