Stock Photo - Astronaut Jeffrey Williams, Expedition 21 flight engineer and Expedition 22 commander, attired in a training version of his Extravehicular Mobility Unit (EMU) spacesuit, participates in a spacewalk training session in the waters of the Neutral Buoyancy Laboratory (NBL) near NASA's Johnson Space Center. Divers are in the water to assist Williams in his rehearsal, which is intended to help prepare him for work on the exterior of the International Space Station.

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