Nemo 33

It’s the deepest scuba diving indoor pool in the world. Located in Brussels, Nemo 33 has a maximum depth of 133 ft. It’s filled with 2,787,878 million liters of highly filtered, non chlorinated spring water and maintains a constant water temperature of 30 degrees Celsius. It took seven years to construct and has plenty of underwater tunnels and rooms for visitors to explore.

Nemo opened to the public in 2004 and is primarily used by scuba divers and film crews looking to film underwater scenes. If you’re a certified diver you can dive in the world’s deepest indoor pool by paying a nominal fee. The pool also offers diving classes to non divers.

Location: Brussels, Belgium

Cost: $3 Million