No, it is not another pool for swmming, but diving. Divers have no need to fear about the potential dangers in the ocean, such as ship wreckage. John Beernarts originates the idea and runs what's billed as the world's deepest indoor pool. The pool is located on the outskirts of Brussels, Belgium.

"The name is NEMO33. 33 because its 33 meters deep and 33 degrees Celsius."

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Source:
http://www.nemo33.com