This was the 10th spacewalk for Whitson and the second for Fischer.
Two Nasa astronauts aboard the International Space Station (ISS) have successfully completed an emergency spacewalk to replace a failed data relay box that controls some of the key hardware on the orbital outpost.
Expedition 51 Commander Peggy Whitson and Flight Engineer Jack Fischer of Nasa also installed a pair of antennas on the station on May 23 to enhance wireless communication for future spacewalks.
Spacewalkers have now spent a total of 1,250 hours and 41 minutes working outside the station during 201 spacewalks in support of assembly and maintenance of the orbiting laboratory. This was the 10th spacewalk for Whitson and the second for Fischer.