Tunnel blasting - GIF

Tunnel blasting.

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Previously:

Pipeline rock blasting - GIF
Tunnel blasting shockwave - GIF
Underwater rock blasting - GIF
Underwater rock blasting for dredging - GIF

I'm guessing that was an unintended result!?

I thought you asked for 40kg of explosives? Oh you meant 40 pounds.....

The guy covers his ears and the explosion knocks his hard hat off...how's that minor concussion?