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 5 m  and 10 m , and a large circular pit descending to a depth of 33 m . It is filled with 2,500,000 liters of non-chlorinated, highly filtered spring water maintained at 30 °C  and contains several simulated underwater caves at the 10 m 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.

So 11 years ago, a civil engineer with a passion for the underwater world decided that it was time this situation was redressed. John Beernaerts’s dream of creating the world’s first indoor diving complex began as a simple doodle, sketched on a napkin in a Brussels bar. The place is very clean. All the equipment is modern, well set up and maintained to a high standard. On the pool’s surface, a nice red Zodiac helps new divers learn to step off the boat and climb back into it after the dive. The deepest part of the pool is actually quite wide. Since 2004, over 100,000 divers have visited Nemo.  So, far, they all have come back alive.  No sharks or terrifying octopuses to contend with in these waters.  No stingrays to pinch you as you explore deep sea passageways.  No jellyfish to make you squeal as you try to make your way back to shore.

Brussels, officially the Brussels Region or Brussels-Capital Region is the de facto capital city of the European Union and the largest urban area in Belgium. It comprises 19 municipalities, including the City of Brussels proper, which is the constitutional capital of Belgium, the seat of the French Community of Belgium and of the Flemish Community. Brussels has grown from a 10th-century fortress town founded by a descendant of Charlemagne into a metropolis of more than one million inhabitants. The metropolitan area has a population of over 1.8 million, making it the largest in Belgium. Since the end of the Second World War, Brussels has been a main centre for international politics. Its hosting of principal EU institutions as well as the headquarters of the North Atlantic Treaty Organization  has made the city a polyglot home of numerous international organisations, politicians, diplomats and civil servants.