Stock Photo - NASA astronauts Doug Hurley (foreground), STS-135 pilot; and Chris Ferguson, commander, attired in training versions of their shuttle launch and entry suits, are pictured during a water survival training session in the Neutral Buoyancy Laboratory (NBL) near NASA's Johnson Space Center. STS-135 is planned to be the final mission of the space shuttle program.

Stock Photo: NASA astronauts Doug Hurley (foreground), STS-135 pilot; and Chris Ferguson, commander, attired in training versions of their shuttle launch and entry suits.

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