We are headed to CTI in early July--can't wait. We want to scuba dive and snorkel.

That said, I am out of shape and need to use the time before the trip to get more fit. I plan to start swimming, because it is my understanding that you must take a swim test before you can scuba dive. Plus, I don't want to be out in open water and not be as strong a swimmer as I could be.

What will the swim test be like? How far will I have to swim? Is there a time limit? Do we need to tread water for a certain period of time?

Many thanks for any answers you can give me!