Impressed by a slow-motion shot of a rocket engine in a water tank

The video slowed down the experiment of burning Warped Perception's mini-rocket engine in the underwater glass tank, surprising many people.

1. Find your heart with a slow turn when the guy jumps into 1000 mousetrap
2. Using electric saws to cut water balloons, interesting things happened

Guess what the mini rocket engine is burning under water to launch and what will happen to the glass tank. Watch the video for answers!