Stock Photo - Astronaut Michael E. Lopez-Alegria, Expedition 14 commander and NASA space station science officer, gives a thumbs-up signal while being submerged in the waters of the Neutral Buoyancy Laboratory (NBL) near Johnson Space Center. Lopez-Alegria is attired in a training version of the Extravehicular Mobility Unit (EMU) space suit.

Stock Photo: Astronaut Michael E. Lopez-Alegria, Expedition 14 commander and NASA space station science officer, gives a thumbs-up signal while being submerged in the waters.

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