On February 16, 2018, American astronaut Mark Vande Hei and Japanese astronaut Norishige Kanai performed a spacewalk. The astronauts repositioned two robot arm grapple mechanisms following repair work last month. The non-working mechanical manipulator gripper will eventually be returned to Earth aboard a SpaceX Dragon cargo ship, refurbished and re-launched. The EVA (extravehicular activity) lasted 5 hours and 57 minutes. This was the fourth spacewalk for Mark Vande Hei and the first for Norishige Kanai, who is the fourth Japanese astronaut to walk in space.