Pavel Vlasov, head of the Gagarin Cosmonaut Training Center, during the ISS crew's winter survival training in the Moscow Region.

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Pavel Vlasov, head of the Gagarin Cosmonaut Training Center, during the ISS crew's winter survival training in the Moscow Region.

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From left: NASA astronaut Christine Koch and Roscosmos cosmonauts Andrei Borisenko and Nikolai Chuba during the ISS crew's winter survival training in the Moscow region.

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NASA astronaut Christine Koch during the ISS crew's winter survival training in the Moscow region.

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NASA astronaut Christine Koch during the ISS crew's winter survival training in the Moscow region.

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NASA astronaut Christine Koch during the ISS crew's winter survival training in the Moscow region.

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Roscosmos cosmonaut Andrei Borisenko during the ISS crew's winter survival training in the Moscow region.

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Roscosmos cosmonaut Nikolai Chuba during the ISS crew's survival training in a winter forest in the Moscow Region.

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Roscosmos cosmonaut Nikolai Chuba during the ISS crew's survival training in a winter forest in the Moscow Region.

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Roscosmos cosmonaut Andrei Borisenko, NASA astronaut Christina Koch and Roscosmos cosmonaut Nikolai Chuba, from left, during the ISS crew's survival training in a winter forest in the Moscow Region.

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Roscosmos cosmonauts Nikolai Chuba, Andrei Borisenko and NASA astronaut Christina Koch, from left, during a survival training of the ISS crew in a winter forest in the Moscow Region.

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Roscosmos cosmonaut Andrei Borisenko and NASA astronaut Christina Koch during the ISS crew's survival training in a winter forest in the Moscow Region.

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From left: Roscosmos cosmonauts Nikolai Chuba and Andrei Borisenko and NASA astronaut Christina Koch during the ISS crew's survival training in a winter forest in the Moscow Region.

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Roscosmos cosmonaut Andrei Borisenko and NASA astronaut Christina Koch during the ISS crew's survival training in a winter forest in the Moscow Region.

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RSA cosmonaut Nikolai Chuba takes part in a winter forest survival training in the Moscow region.

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