Coming in at a whopping 113 feet deep, Nemo 33 located in Brussels, Belgium is the world’s deepest swimming pool. The pool holds 2.5 million litres of non-chlorinated, highly filtered spring water maintained at 30 °C (86 °F) and contains several underwater caves at 33 feet deep. Within the pool there are also several flat platforms of varying depths and a large circular pit with a depth of 108 feet.
Obviously this massive pool was not designed for you to swim to the bottom on just a lungful of air, rather it functions as a multi-purpose diving instruction, recreational, and film production center. To give divers more time to reach the bottom, the world’s deepest pool also features three pressurized rooms with constantly renewed air.
Nemo 33 was designed by Belgian diving expert John Beernaerts. Included in the design are fourteen underwater windows that make sure visitors who aren’t up for a deep pool adventure don’t miss out on any underwater action.