Chamitoff and Feustel in the Endeavour Payload Bay during EVA 1

ISS027-E-034419 (20 May 2011) --- NASA astronauts Andrew Feustel (bottom right) and Greg Chamitoff (top left), both STS-134 mission specialists, participate in the mission's first session of extravehicular activity (EVA) as construction and maintenance continue on the International Space Station. During the six-hour, 19-minute spacewalk, Feustel and Chamitoff retrieved long-duration materials exposure experiments and installed another, installed a light on one of the station?s rail line handcarts, made preparations for adding ammonia to a cooling loop and installed an antenna for the External Wireless Communication system.