hi guys. remember when u start taking the course from padi. you have to watch the cd. and i remember watching and there is a part there that a DM threw a "small plane" something like that under water. it looks like a missile but its just a bigger than a ballpen. it can be thrown around under water, play with your buddy, what do you call it? and where can i buy it? thanks guys. i just wanna have fun under water.