Nemo 33 is an ingenious complex designed by John Beernaerts, located in Brussels, Belgium. It is considered the deepest indoor swimming pool in the world, having a maximum depth of 33 meters and containing approximately 2.5 million liters.
Highly filtered spring water is used to fill up this deep swimming pool. The water is maintained at a constant temperature of 30 °C. The divers find here several simulated underwater caves and outside-visitors have the opportunity to look into the pool at various depths through underwater windows.
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Founded in 2004, Nemo 33 was especially conceived for diverse activities such as diving instruction, recreational ventures and even for film production. More about Nemo 33 here.