MOSCOW (AFP) - Six volunteers on Friday stepped out into the outside world after spending the last one-and-a-half-years locked away in an isolation module in Moscow to simulate the effects of a return trip to Mars. The multi-national crew showed no ill effects after emerging from the capsule where they had lived and slept for the last 520 days but were clearly delighted they completed their earth-bound journey to the Red Planet. A researcher broke the seal and then opened the door of the capsule and all six crew members, dressed in blue overalls, walked out one-by-one in good health to cheers from scientists and family who had gathered. The international crew has completed the 520 day mission, commander Alexei Sityov, one of three Russian participants in the experiment, told Russias space bosses in formal military style after exiting the capsule. The programme has been fully carried out. All the crew members are in good health. We are now ready for further tests, he added in comments.