Two astronauts—one American, the other Japanese—suited up to venture outside the International Space Station to finish work upgrading the outpost’s robotic Canadarm2, a process that has now involved five extravehicular activities over some four months.

The six-hour U.S. EVA-48 began when NASA astronaut Mark Vande Hei and Japan Aerospace Exploration Agency astronaut Norishige Kanai put on their suits and exited the Quest airlock.