I got this idea from my husband. When he was younger he took a diver class, and part of the requirements to pass the class, was you have to go in a 30 foot deep dive training pool, while at the bottom of the pool you have to be able to blow up a balloon. Once the balloon is filled with air, you tie it and release it. As the balloon is going to the top, the air expands in the balloon so much that the balloon will pop before it hits the surface. How cool would that be to see in slow motion?
