Add this to your list of things you never knew existed but, now that you do, you now desperately need: a visit to NEMO33, the deepest pool on Earth.
God help you if you have to get your PADI certification in a public pool—you're about to spend more than a few hours steeping in all sorts of fun bodily fluids. You're better off buying a plane ticket to Brussels, home of the deepest—and likely cleanest—indoor pool in the world.
Think the 8-foot-deep pool in your parents' backyard is the bee's knees? The Nemo 33 pool in Brussels, Belgium is 115 feet deep, son. Created for training scuba divers, it's the world's deepest by what I would guess is a pretty fair margin. If you go, remember that it's in Europe, so don't forget to pack a banana…