Six scientists have emerged from a four-month isolation experiment simulating a mission to the moon.
The Russian and American volunteers were housed in a series of capsules in a research facility in Moscow.
The project - run by the Russian and US Space agencies - conducted psychological and physiological research on the team.
Harry Horton reports from Moscow.
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I'm at the wonderfully named institute of biomedical problems of the Russian Academy of Science where six scientists - three women, three men, are about to emerge from 120 days in isolation. They've had limited communication with the outside world and have been sealed off in their own atmosphere.
Their mission has been designed to mimic a spaceflight, and they've been housed in a series of interconnected space station like modules.
Over the past four months they've taken part in more than 70 experiments. One of the most spectacular was a simulated moon walk where the crew wore virtual reality glasses and space suits.
Here's one of the program managers, William Paloski from NASA
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Exactly 120 days after entering the facility, it was time for the crew to emerge.
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The scientists have just been asked what they missed the most while they were inside - one of them has said steak, another's said pizza. I think we can assume space food isn't the best.
Reinhold Povilaitis is one of the American scientists who's been locked away.
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This mission comes at a time of rising tensions between Russia and the US. But on a scientific front, the two countries still work closely.
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Next year this facility will host an eight month isolation experiment. Eventually, scientists hope they could last as long as five years.
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