What's inside an Air Raid Siren? ─ What's Inside?

How does an air raid siren make such a loud noise without electricity? Make sure to watch Mark's video of the World's Largest Air Horn!: https://youtu.be/pFEB0chiuJA

Mark's channel here: https://www.youtube.com/user/onemeeel...

What's the loudest sound you've ever heard?

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