this post was submitted on 11 Sep 2023
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Ever since the linked clip was posted, when this time of year comes round I think about the people in that video and the sound of all of those PASS devices going off.

Current BBC news coverage: September 11: America remembers lives lost in al-Qaeda attacks

PASS Devices: Wikipedia

Dr Mark Heath: CNN Transcript

I accept that this might not be the right community to share this.

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[–] Ubermeisters 2 points 1 year ago (1 children)

Those PASS devices sound like a really creepy cricket noise almost when they chirp together but out of phase from each other.

[–] [email protected] 1 points 1 year ago

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”.