Clad in U.S.-built Extravehicular Mobility Unit (EMU) spacesuits, the ISS Expedition 12 crew make their way into the crew lock compartment of the station's Quest airlock as they begin the first spacewalk of their mission. Space station commander Bill McArthur is already inside the airlock, while flight engineer Valery Tokarev prepares to join him. Credit: NASA TV. Click to enlarge.
