Sellers translates along the S1 Truss during EVA3 on STS-121 / Expedition 13 joint operations

S121-E-07412 (12 July 2006) --- Astronaut Piers J. Sellers, STS-121 mission specialist, translates along a truss on the International Space Station during the mission's third and final session of extravehicular activity (EVA) while Space Shuttle Discovery was docked with the station.