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Astronauts Daniel W. Bursch and Carl E. Walz (obscured) go through preparations in the crew lock of Quest prior to the February 20 space walk. The photograph was taken with a digital still camera by cosmonaut Yury I. Onufrienko, Expedition Four commander. Onufrienko remained onboard the International Space Station (ISS) while the two flight engineers, attired in NASA extravehicular mobility units (EMU), worked on the orbital outpost, logging a total of 5-hours, 47-minutes outside the station. The two tested equipment and procedures for the Airlock Quest and performed other tasks to prepare for Space Shuttle Atlantis’ STS-110 mission in April. The space walk began at 5:38 a.m. (CST) and ended at 11:25 a.m