The idea was grand. The outcome not as expected:
4:58 – LOL oops. Lesson learned, lucky someone didn’t end up with a piece of something in their head.
Their 10 ft tannerite pipe worked fine… I guess 60ft was too long for the explosion to propagate?
There are a lot of suggestions on their youtube video comments on what to do to make that long one work, I have no idea if any of them know what they are talking about though.