I happened upon this guy several months ago. He has a bunch of interesting videos. Check out the one on Dragon's Breath shotgun shells, you'll love it. AT
I am familiar with them, and several other versions. If it is the company I think it is, they are also the only source for .410 Arial flares. (Springfield arms stopped making them years ago.)
That underwater plume reminds me of the effect used in Stargate SG-1 when they dailed up another planet!