Photographic documentation of Extravehicular Activity (EVA) 23 Prep in the Quest airlock. Astronaut Karen Nyberg, Expedition 36 flight engineer, holds a microphone and a checklist as she sits in front of the Airlock hatch.

European Space Agency astronaut Luca Parmitano (left) and Astronaut Chris Cassidy,both Expedition 36 flight engineers,pose for a candid photo with Extravehicular Mobility Unit (EMU) hardware in the Quest Airlock.

View of NASA astronaut Chris Cassidy (left) and European Space Agency astronaut Luca Parmitano (right), Expedition 36 flight engineers, preparing for a dry run in the International Space Stations Quest airlock in preparation for the first of two sessions of extravehicular (EVA) scheduled for July 9 and July 16. Both have donned their EMUs. Astronaut Karen Nyberg, Expetition 36 flight engineer, is visible in the center.