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Nemo 33 is the world's deepest swimming pool. Granted, as Oh Gizmo! rightly points out, it isn't a swimming pool at all. Instead, it is a diving pool. It offers a unique experience for those looking to have a non-typical thrill. Nemo 33 is particularly good for people who are looking to learn how to deep sea dive without actually going out into the sea. It also offers fun packages for special occasions.

Located in Brussels, Belgium, Nemo 33 boasts a maximum depth of 34.5 metres. Containing 2.5 million liters of non-chlorinated, highly filtered spring water maintained, Nemo 33 is like one giant cylinder. It also has simulated underwater caves at the 10 metres depth level.