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!:    • World's Largest Horn Shatters Glass  

Watch the Behind the Scenes of our Day with Mark!    • Tesla vs World's Largest Horn!  

Mark's channel here:    / onemeeeliondollars  

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

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