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August 13, 2012
NASA astronaut Rex Walheim (left), STS-135 mission specialist, and astronaut Mike Fossum are aided by divers as they work in a mock-up of the space shuttle's payload bay as the crew of STS-135 trains for a spacewalk in the Neutral Buoyancy Laboratory near NASA's Johnson Space Center on March 10, 2011. Photo credit: NASA Photo/Houston Chronicle, Smiley N. Pool

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