Located a short drive outside Moscow, Star City is a giant Cosmonaut Training Centre where spacemen perform maintenance exercises and develop skills in a shuttle mock-up underwater.
Underwater training exercises are the closest thing that engineers can develop to simulate the weightlessness of space.
Crews can also acquire and master the skills necessary to accomplish operations on the external surface of an orbital space station.
The pool is capable of accommodating a 20-tonne space station module, and has a depth of 12metres, a diameter of 23metrers and a volume of 5,000 cubic metres.
Opened in 1980, it was designed to train cosmonauts, test objects models and carry out experimental research into simulated micro-gravity.
Equipped with health sensors, all any budding cosmonaut has to do is match the height, weight and medical requirements established by the Russian Space Agency.