English: NASA astronaut John "Danny" Olivas, STS-128 mission specialist, uses a digital still camera to expose a photo of his helmet visor during the mission's second session of extravehicular activity (EVA) as construction and maintenance continue on the International Space Station. Also visible in the reflections in the visor are various components of the station and European Space Agency astronaut Christer Fuglesang, mission specialist, anchored to a Canadarm2 mobile foot restraint. During the six-hour, 39-minute spacewalk, Olivas and Fuglesang installed the new Ammonia Tank Assembly on the Port 1 Truss and stowed the empty tank assembly into the Space Shuttle Discovery's cargo bay.