The World’s deepest indoor swimming pool is called Nemo33 and it is located in Brussels, Belgium.
The facility offers a one of a kind training experiance with it’s underwater simulations of caves at the 10 meters depth level. The pool reaches maximum depth of 34.5 meters. The water is kept at a nice and warm 30 °C. There is also an extraordinary restaurant with windows to the pool so when you eat you can see some divers passing by, The restaurant serves Asian food (mainly Thai food).
For more information visit Wikipedia – Nemo33
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Photos by Nemo33 (Visit their site)