I`m laughin my ass off! I did the same thing back in `85. There was a top panel on the tub(ring). It blew straight up. We are so damn lucky no one was killed. We were tubing. If someone would have been over this thing they would have died. It sounded like a cannon. All the trees above moved up so it was some serious air movement. Everyone in the campground was cheering. We all were freaking as to how close we came to dieing.
Its the soap that gets in it. Thats what blows. The shiny shit is the coating off the tub. Notice there ain`t no paint on it! At least that what I think it was. Whatever it was don`t let anyone use it for fire. That is some seriously dangerous sheeeeit.