MacLean and Reiter in the middeck on STS-115 Space Shuttle Atlantis

S115-E-05766 (12 Sept. 2006) --- Astronaut Steven G. MacLean, STS-115 mission specialist representing the Canadian Space Agency, photographed in the midst of a pre-breathe exercise in the Quest Airlock of the International Space Station in preparation for a session of extravehicular activity (EVA). European Space Agency (ESA) astronaut Thomas Reiter (background) assisted MacLean.