It sounds like a WW-II air-raid siren. https://www.youtube.com/watch?v=WgaCNEQzL... | Hacker News

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		chiph on June 6, 2020 \| parent \| context \| favorite \| on: New slats make the Golden Gate Bridge sound like a... It sounds like a WW-II air-raid siren. https://www.youtube.com/watch?v=WgaCNEQzL1Q

djmips on June 7, 2020 [–]

Someone said it's 440Hz and "something I read online" says the UK air raids had a component frequency of 450Hz.

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