On March 30, 2017, American astronauts Robert Kimbrough and Peggy Whitson performed the spacewalk to continue work to set up a second docking port for U.S. crew ferry spaceships. They also installed an upgraded computer relay box and protective shielding. It was the 6th spacewalk for Kimbrough and the 9th for Whitson. Peggy Whitson, a veteran of two earlier long-duration station visits, set a new record for cumulative spacewalk time by a female astronaut, surpassing Sunita Williams’ mark of 50 hours and 40 minutes. When the spacewalk concluded, Whitson’s total EVA time stood at 53 hours and 22 minutes, moving her up to fifth on the list of most experienced spacewalkers.