Foto de stock - NASA astronaut Rex Walheim, STS-135 mission specialist, is lowered into the water March 22, 2011 to train for a contingency spacewalk in the Neutral Buoyancy Laboratory (NBL) in Houston.

Imagen: NASA astronaut Rex Walheim, STS-135 mission specialist, is lowered into the water March 22, 2011 to train for a contingency spacewalk in the Neutral Buoyancy.

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