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October 23, 2013
(7 Dec. 2011) --- NASA astronaut Tom Marshburn, Expedition 34/35 flight engineer; and Canadian Space Agency astronaut Chris Hadfield (mostly obscured), Expedition 34 flight engineer and Expedition 35 commander; attired in training versions of their Extravehicular Mobility Unit (EMU) spacesuits, are about to be submerged in the waters of the Neutral Buoyancy Laboratory (NBL) near NASA's Johnson Space Center. Divers (out of frame) are in the water to assist Marshburn and Hadfield in their rehearsal, which is intended to help prepare them for work on the exterior of the International Space Station. Photo credit: NASA

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