Major City Air Raid Siren

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I'm only 44 (oh *****, that's depressing) but I can recall as a kid that we still had weekly / monthly tests of the sirens across the UK.

I believe they're no longer in-situ as they have something that can broadcast on every TV / Radio / etc if such alerts are needed
 
Right next to it? Its 138db at 100yds!!! That is a sustained sound like .357magnum for God's sake. Now walk 99yds closer.
 

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