I have been through that exact trainer, and it is no joke, you get smashed around by the water, and it is impossible to communicate. Plus, the water is friggin COLD!! There are various leaks and holes around the trainer, and you have to prioritize and tackle each one, you have to hit the lower leaks first before the water level rises. You also have to get the eductor up and running and get water pumped out. Also you have to relay to control to secure power or you "electrocute" (simulated) yourselves and get points take away in the end for that. The biggest and highest pressure hole in a pipe is up high along the back wall, and shoots straight across the trainer, they love to turn that one on and hit some unsuspecting SOB on the opposite side of the trainer, more than a fire hose at full bail turned on you! It sucks when the water starts coming up and you start floating, your freezing, and your hands are numb, and you are trying to put a patch on a pipe, and you can't hear or barely see the person right next to you.
There is another trainer called the "buttercup" used by the Surface Navy that is similar in nature, and you have to stop the ship from sinking using their variety of patches. And unlike the sub trainer it actually moves!
There are also the DC fire fighter trainers that are alot fun also, all of them teach the necessary steps to help teamwork. Good stuff. Thanks for putting up that article.