I've done it. It is called The Seas Aqua Tour. It is about 3 hours with about 2.5 of a backstage tour. You are in the water for about 30 minutes. That being said, you are doing SNUBA. You have a tank on your back and breathing air through a regulator. They provide the wetsuit, mask, fins, tank, etc. They give you a beverage and take a complimentary picture before you start. Afterwards you hit the shower with towels and soaps provided. Any questions, just ask. It is a lot of fun.