Stock Photo - Russian cosmonauts Oleg Artemyev (left) and Alexander Skvortsov, both Expedition 3940 flight engineers, participate in an emergency scenario training session in an International Space Station mock-uptrainer in the Space Vehicle Mock-up Facility at NASA's Johnson Space Center.

Stock Photo: Russian cosmonauts Oleg Artemyev (left) and Alexander Skvortsov, both Expedition 3940 flight engineers, participate in an emergency scenario training session in.

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