Finished in May of 2004, Nemo 33 is an in-building non-chlorinated facility located in capital of Belgium. It dominates the record as the deepest indoor pool within the world in addition to one of the strangest pools in the world by Popular Mechanics. The mastermind of this pool is a man named John Beernaerts, who made this especially for training and recreational purposes of divers. The pool’s deepest area measures a whopping a hundred and thirteen ft. Not to mention that it contains 660, 500 gallons of extremely filtered spring water containing zero chlorine, maintained at 86 degrees fahrenheit by means of a heater! Even cooler than that, in the truth that if you have the gut to swim around 30 feet deep, you’ll discover hoards of underwater caves which turns the entirety into an incredible underwater maze! Due to the fact that it is such a limitless attraction, they've made the water warm and chemical-free so divers don’t have to wear a wetsuit but enjoy the experience for hours each time.