Russian engineers broke a red wax seal and six men emerged from a metal hatch after 105 days of isolation in a mock spacecraft, still smiling after testing the stresses that space travelers may face on the journey to Mars. Sergei Ryazansky, the captain of the six-man crew, told reporters at a Moscow research institute near the Kremlin on Tuesday that the most difficult thing was knowing that instead of making the 172-million mile journey, they were locked in a windowless module of metal canisters the size of railway cars.

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