Located in Brussels, Belgium, Nemo 33 is the deepest indoor swimming pool in the world, with a maximum depth of 34.5 metres (113 ft). Numerous underwater windows allow outside visitors to look into the pools at various depths. There are two large flat-bottomed areas reaching depth levels of 5m (16 ft) and 10m (32 ft), and a large circular pit plunging to a distance of 33m (108 ft). At the 10m mark are also featured several simulated underwater caves.
Nemo 33 was designed by Belgian expert diver John Beernaerts as a multi-purpose diving instruction, recreational, and film production complex.
Images via Michel Braunstein