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Emergency spacewalk performed by 2 astronauts.
On May 11, 2013 American astronauts Tomas Marshburn and Christopher Cassidy conducted an emergency spacewalk to inspect and replace a device believed to be the source of an ammonia leak in the orbiting laboratory's power system. The space walkers successfully installed a new pump controller box, which contains the mechanical systems that drive the cooling functions, after removing the old one suspected of leaking flakes of frozen ammonia coolant two days earlier. The spacewalk, the third for both Cassidy and Marshburn, who conducted two spacewalks together in July 2009, began at 12:44 UTC. It lasted five and a half hours, an hour less than expected.