On May 22, 2011 American astronauts of the STS-134 crew Andrew Feustel and Michael Fincke performed a spacewalk.
The astronauts from the space shuttle Endeavour completed the sixth-longest spacewalk in history on Sunday after needing extra time to finish maintenance work on the International Space Station.
The EVA lasted 8 hours and 7 minutes.
The spacewalkers worked on the station's cooling system and lubricating elements of the solar array. During the lubrication work, a bolt and washer from a protective insulation cover were lost into space, the U.S. space agency said. Finke also installed two radiator grapple bar stowage beams on the station, while Feustel conducted work on the Special Purpose Dexterous Manipulator installing a cover on one of the robot's cameras and lubricating the snares that allow the robot to grab equipment.