You may remember our friend Destin at Smarter Every Day shooting an AK-47 underwater. It was a cool experiment, but the pressure caused the aquarium to shatter, ruining what we now know would have been an amazing shot. To solve this problem, he built a sort of reverse-periscope for a Phantom camera and shot the AK-47 in a pool. The results are absolutely stunning.
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The expanding bubble that chases the bullet, collapses in on itself, and then explodes outward again left us speechless (skip to 1:50 if you're impatient). It looks almost like a nuclear bomb going off. Simply an incredible phenomenon captured perfectly at 27,450 frames per second. Amazing. [Smarter Every Day]