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JSC2012-E-034752 (14 March 2012) --- NASA astronaut Tom Marshburn, Expedition 34/35 flight engineer, wearing a training version of the Extravehicular Mobility Unit (EMU) spacesuit, is 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 in his rehearsal, which is intended to help prepare him for work on the exterior of the International Space Station. Photo credit: NASA
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