The swim test... mine was sprung on me in the middle of assisting with a rescue class, in a OW lagoon... something about 'accidents aren't planned'. I think this was also to show the class that what they were asked to do wasn't that hard and maybe allow me to showoff a little. I did very well, I regularly swim laps for exercise, but learned the difference/value of good snorkel vs a cheapo. That cheap snorkel almost killed me, I couldn't get enough air. I've since replaced that snorkel with a Scubapro Shotgun, the difference is amazing.