http://www.linkinn.com/_World_s_Deepest_Swimming_Pool

Nemo 33 is a recreational diving center in Brussels, Belgium that is home to the world's 
deepest swimming pool. The pool itself consists of a submerged structure with flat platforms 
at various depth levels. The pool has two large flat-bottomed areas at depth levels of 5m (16 ft) 
and 10m (32 ft), and a large circular pit descending to a depth of 33m (108 ft). It is filled with 
2,500,000 litres of non-chlorinated, highly filtered spring water maintained at 30°C (86°F) and 
contains several simulated underwater caves at the 10m depth level. 
There are numerous underwater windows that allow outside visitors to look into the pools at 
various depths. The complex was designed by Belgian diving expert John Beernaerts as a 
multi-purpose diving instruction, recreational, and film production facility, and opened in 2004. 

The pool has multiple levels of 1.5m, 6m, 10m and of course the 33m tower bottom. At the 10m level there is a tunnel in which there are three dry (cave) areas you can surface in. The tunnel leads to the 33m deep tower.


Exiting the tower you head into the tunnel and the 10m level. There are two small caves on the left and right and a very large dry chamber above them. This chamber you can surface in at the very start and finish of the tunnel.

Nemo 33, a diving school in Brussels, operates the world’s deepest pool which goes to a depth of over 33 meters. Check out their great photo gallery of the pool. Talk about going off the deep end.

Water: 2.500.000 liters of spring water at 30°C, visbility >33m, without chlorine smell 
Ferment: 2 pools, 3 pits (5, 10 and 33m) 
Decoration: Caves at -10m, possibility of fixing of new decorations. 
Never seen before: Three permanent bells of air under pressure (-9m, -7m, air renewed permanently), they avoid ceaseless return tickets bottom-surface of the student and his instructor. 
Technic: 250 anchoring points distributed in the tank to: 
changer the aspect of the swimming pool (for the amateurs) 
adapt it to the need for a film making 
to adapt it to the need for the scientists and technicians 
Lightning : Natural & artificial 

Free Diving Video: http://youtube.com/watch?v=ulB_kdOUhAc