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yes, it is.
It would also have created an explosion inside of the "panic room" being an enclosed space, too. At the very least they should have had eardrum damage. The propane tank on the outside would have been a quick explosion, rupturing the tank and shredding the metal as well as anyone close.
If you can find it, there was an old NOVA program done in the early 80s on the use of hydrogen as a fuel. In order to show the inherent safety of compressed hydrogen tanks, they set up a tank of compressed propane with an ignition source nearby and got a sharpshooter with armor-piercing bullets to pop a hole in the tank. You didn't get to see much time between hole, ignition and a disintegrated propane tank. The same test with the hydrogen tank made this wonderful high-pitched hiss and then the blow-torch effect as the gas lit up and no explosion. By the time the gas pressure was low enough inside the hydrogen tank for the flame to get inside and flame out, there wasn't enough gas left to cause an explosion.
I'd love to find that video again because it really points out the differences in actual safety versus fearful perceptions :)
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