The 520-day final stage of the experiment, which was intended to simulate a full-length crewed mission, began on 3 June 2010 and ended on 4 November 2011. This stage was conducted by a six-man international crew, consisting of three Russians, a Frenchman, an Italian/ Colombian and a Chinese citizen. The stage included a simulation of a crewed Mars landing, with three simulated Mars-walks carried out on 14, 18 and 22 February 2011. The experiment ended on 4 November 2011, with all the participants reportedly in optimal physical and psychological condition.