YES!!!! If you surface too quickly you can damage your lungs, not a good thing. You can hurt yourself in 3-5 feet of water. Please, for your safety wait until you take the class or as "scubajoe" said take a discover scuba class at a dive shop.TheAlpha:Thanks again guys. I believe the class at school is conducted in our swimming pool, so I will get to experience that I need soon enough. Would it be ok if I used a "spare air" in a pool or pond? If I ran out I could surface quickly. I guess I just want to experience being under water for a longer that I can hold my breath. Are these bad habits to start out on?
On another note, you say that you are a college student. Well Spare Air's cost around $300 new at a dealer, do you want to throw that money away? Save your money for the gear you will want to buy after you get certified.
We don't want to dull your desire to dive, we want you to do it as safe as possible.