An international crew of researchers, from left, Alexey Sitev of Russia, Romain Charles of France, Suhrob Kamolov of Russia, Alexander Smoleevskiy of Russia, Diego Urbina of Italy/Colombia and Wang Yue of China pose at a news conference after a 520-day simulation of a flight to Mars, in Moscow, Russia, Tuesday, Nov. 8, 2011. (AP Photo/Misha Japaridze)
An international crew of researchers, from left, Alexey Sitev of Russia, Romain Charles of France, Suhrob Kamolov of Russia, Alexander Smoleevskiy of Russia, Diego Urbina of Italy/Colombia and Wang Yue of China pose at a news conference after a 520-day simulation of a flight to Mars, in Moscow, Russia, Tuesday, Nov. 8, 2011. (AP Photo/Misha Japaridze)
An international crew of researchers, from left, Alexey Sitev of Russia, Romain Charles of France, Suhrob Kamolov of Russia, Alexander Smoleevskiy of Russia, Diego Urbina Italian-Colombian and Wang Yue of China pose at a news conference after a 520-day simulation of a flight to Mars, in Moscow, Russia, Tuesday, Nov. 8, 2011. (AP Photo/Misha Japaridze)
MOSCOW (AP) ? Staying inside cramped, windowless modules for nearly a year-and-half was a tough challenge for an international crew of six researchers simulating a mission to Mars under 24-hour surveillance by scientists.
They said Tuesday they coped with the fatigue and stress of isolation with simple methods: doing exercises, reading books, trying to learn foreign languages ? but above all keeping themselves busy with their work.
The crew of three Russians, a Frenchman, an Italian-Colombian and a Chinese appeared energetic and joyful at their first news conference after leaving their claustrophobic quarters last Friday.
The facility at Moscow's Institute for Medical and Biological Problems, Russia's premier space medicine center, included living compartments the size of a bus, connected with several other similarly sized modules for experiments and exercise.
"I wanted to take part in an interesting adventure and also do something useful for humankind, and I now feel happy that I have succeeded," said Russian team leader Alexey Sitev.
He said there were no conflicts among the crew thanks to thorough preparations and training.
"I actually thought that it would be harder and more stressful for me, and I was surprised how smoothly it went," said Sitev, a blue-eyed, soft-spoken former navy diver.
Sitev, who got married just a few weeks before the start of the mission, said his wife stoically accepted his absence.
"She would have liked for me to stay home of course, but she trusted me and felt that she had to cope with it since it was necessary for me to take part," he said.
Scientists said that long confinement without daylight and fresh air put team members under stress as they grew increasingly tired of one another's company. They warned that isolation challenges are actually stronger on a simulated mission because of the lack of euphoria and risk of a real space flight.
"A key thing that we can't simulate is the feeling of danger," said the mission chief, cosmonaut Boris Morukov. "They were always aware of us following them from behind the wall."
He said the second half of the mission was the most difficult, as the initial challenges of learning to deal with scientific equipment were behind them and the daily routine grew increasingly monotonous.
Morukov said each crew member will be paid about $100,000 for the mission.
Along with more than 100 scientific experiments that kept them busy most of the day, crewmembers watched movies, played computer games and celebrated holidays together.
They communicated with their families and space officials via the Internet, which was delayed and occasionally disrupted intentionally to imitate the effects of space travel. They showered only once every 10 days or so, pretending to conserve water, and ate food similar to that on the International Space Station.
Midway through the simulation, the crew even imitated a landing on Mars, venturing from their quarters in heavy space suits to trudge into a sand-covered room.
"This mission was a success and so we can go forward and now plan to go to Mars and move confidently," said Frenchman Romain Charles.
A real flight to Mars is a distant prospect because of huge costs and massive technological challenges, particularly the task of creating a compact and relatively lightweight shield to protect the crew from deadly space radiation. NASA is aiming for a nearby asteroid around 2025 and then on to Mars in the 2030s.
Italian-Colombian Diego Urbina said social networks helped ease the pressure. "You get the feedback, like all the kids that want to go to Mars, and they tell you so many nice things, many things about their own dreams, and that gives you a lot of impulse to go on," he said.
Despite all the efforts to stay busy and motivated, the fatigue was building up and the crew was dreaming about what they would do after their return.
"I wanted to take my family to the sea, lie down and watch the waves at my feet," said Sukhrob Kamolov, a Russian crew doctor. "And I also dreamed about something that would give me lots of adrenaline, something like bungee jumping in Australia."
Kamolov said the isolation had changed him. "I realized that time goes fast, and I must spend more time with my family," he said.
The crew said they weren't paying too much attention to political news, but they were aware of Prime Minister Vladimir Putin's decision to return to the presidency after the March election, which could potentially extend his rule for another 12 years.
"We are experts in long-term missions, so I can only wish him luck," Sitev said.
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