Around the old mining areas of North Wales, you can find rock cannon: old Welsh firework sites. Most of the world has never heard of them: so we recreated them on a test range. • Thanks to Steve from Live Action FX: http://liveactionfx.com/ • Thanks to Owain for the idea!

Edited by Michelle Martin: https://twitter.com/mrsmmartin

Filmed safely: https://www.tomscott.com/safe/

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