Russian cosmonauts Oleg Kotov, Expedition 38 commander, and Sergey Ryazanskiy, flight engineer, attired in Russian Orlan spacesuits, participate in a session of extravehicular activity (EVA) in support of assembly and maintenance on the International Space Station. During the eight-hour, seven-minute spacewalk, Kotov and Ryazanskiy worked with two high-fidelity cameras, removed the Vsplesk experiment package and jettisoned it and replaced it with hardware for a more sophisticated earthquake-monitoring experiment, Seismoprognoz, which they attached to a Zvezda handrail. December 27, 2013.