Spacewalking astronauts wrap up maintenance work on space station

Two astronauts tackled a list of leftover maintenance tasks outside of the International Space Station Saturday (March 13), completing work that was originally scheduled to be done on previous spacewalks.

Expedition 64 crewmates Victor "Ike" Glover and Mike "Hopper" Hopkins, both with NASA, ventured out of the space station's Quest airlock on Sunday (March 13) for the 6 hour and 47 minute extravehicular activity (EVA). The spacewalk, which began at 8:14 a.m. EST (1314 GMT), marked their third outing together since arriving at the station in November on SpaceX's Dragon spacecraft "Resilience."

The two astronauts' first task, postponed from a spacewalk earlier this month, was to vent the remaining ammonia from two jumper cables that were used to feed coolant into the station's thermal control system. Working at the far left end of the orbiting complex's backbone truss, Glover and Hopkins released the ammonia from the pair of hoses and then stowed one jumper in place and relocated the other to the side of the airlock should they are needed to help find coolant leaks in the future. 

"I see venting," said Hopkins after releasing the ammonia from the first jumper. "Oh yeah, look at that go!" 

"That is more than I thought," he said a few moments later as coolant continued to spray into space.

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NASA astronaut Victor Glover, seen here in a photograph taken by Japan Aerospace Exploration Agency (JAXA) astronaut Soichi Noguchi from inside the International Space Station, conducts a spacewalk with NASA astronaut Michael Hopkins on Saturday, March 13, 2021. (Image credit: NASA TV)

Because ammonia is toxic, the two spacewalkers paused to inspect each other's spacesuits to make sure no ammonia ice crystals were attached. 

"I can see the top of your helmet, your lights, the PLSS [portable life support system], your shoulders, your arms — I see nothing that is stuck," reported Glover about Hopkins' spacesuit. "It looks clean."

After stowing the jumpers and cleaning up the tools they used to vent the ammonia, Glover and Hopkins split ways to continue separate tasks outside the space station.

Glover, who was designated extravehicular crew member 1 (EV1) and wore a spacesuit with red stripes for identification, headed off to the Unity node to replace a failed wireless camera transceiver with a new one.

Meanwhile, Hopkins, wearing a spacesuit with no stripes as EV2, transitioned over to the ESA (European Space Agency) Columbus laboratory, where he worked to run electrical cables to the module's Bartolomeo external experiment platform. Glover and Hopkins had installed the same rigging during a Jan. 27 spacewalk, but ran into issues connecting some of the cables, preventing the platform from becoming fully operational.

"Mated!" exclaimed Hopkins after successfully connecting the first of the troublesome connectors. "And the crowd goes wild!"

"Nice!" replied Glover.

"Good job! Wow! Excellent. Good news," radioed ESA astronaut Andreas (Andy) Mogensen, who was guiding Hopkins and Glover through their work from Mission Control in Houston.

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In a view from NASA astronaut Michael Hopkins’ high definition helmet camera, NASA astronaut Victor Glover is seen working outside the International Space Station on a spacewalk on Saturday, March 13, 2021.

In a view from NASA astronaut Michael Hopkins’ high definition helmet camera, NASA astronaut Victor Glover is seen working outside the International Space Station on a spacewalk on Saturday, March 13, 2021. (Image credit: NASA TV)

As Hopkins continued working on the second and third of four Bartolomeo cables, Glover completed the wireless transceiver replacement and moved on to installing a "stiffener" on the Quest airlock's thermal cover to provide added structural integrity and to prevent the cloth hatch from being jostled open when not in use.

"Hopper, there's something in my right eye," Glover radioed to Hopkins. "I can see, but it is irritating trying to keep it open."

Glover continued working on the hatch stiffener, but described the issue with his eye in more detail to Mission Control.

"It's irritated if I keep it open. If I close it, I am fine, slightly irritated and it's watery. So tears, it is creating tears," said Glover, adding that blinking seemed to help. 

A few minutes later, Glover said his right eye was back to normal.

In a view from NASA astronaut Michael Hopkins’ helmet camera, ammonia coolant can be seen venting into space (at right) as part of Hopkins’ and Victor Glover’s tasks during a spacewalk on Saturday, March 13, 2021 outside of the International Space Station. (Image credit: NASA TV)

Hopkins, meanwhile, had no joy with latching down the fourth connector on the Bartolomeo platform. Despite his best efforts, including using a tether as a makeshift handle to pull down on its locking mechanism, Hopkins could not get the cable to seat and Mission Control advised he stand down. 

Instead, Hopkins moved on to reconfigure a ham radio antenna on the Columbus module. Astronauts use ham radio to connect with enthusiasts and students around the globe as both an educational and public outreach tool.

NASA astronaut Victor Glover works outside of the International Space Station’s Quest airlock on a Saturday, March 13, 2021 spacewalk with astronaut Michael Hopkins (not pictured).  (Image credit: NASA TV)

As their final task for the spacewalk, Glover and Hopkins came together to begin routing two ethernet cables for high-definition cameras on the port truss. 

The spacewalk came to an end at 3:01 p.m. EST (2001 GMT) with the repressurization of the Quest airlock.

Glover has now spent a total of 26 hours and 7 minutes on four spacewalks. Hopkins has now logged 32 hours and 1 minute on his five EVAs. This was the 237th spacewalk in support of the assembly and maintenance of the International Space Station, for a total time of 62 days, 3 hours, and 54 minutes.

Robert Pearlman is a contributing writer and the editor of, a partner site and the leading space history news publication. Follow collectSPACE on Facebook and on Twitter at @collectSPACE. Follow us @Spacedotcom and Facebook . Original article on

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Robert Z. Pearlman Editor, Contributor

Robert Pearlman is a space historian, journalist and the founder and editor of, an online publication and community devoted to space history with a particular focus on how and where space exploration intersects with pop culture. Pearlman is also a contributing writer for and co-author of "Space Stations: The Art, Science, and Reality of Working in Space” published by Smithsonian Books in 2018. He previously developed online content for the National Space Society and Apollo 11 moonwalker Buzz Aldrin, helped establish the space tourism company Space Adventures and currently serves on the History Committee of the American Astronautical Society, the advisory committee for The Mars Generation and leadership board of For All Moonkind. In 2009, he was inducted into the U.S. Space Camp Hall of Fame in Huntsville, Alabama. In 2021, he was honored by the American Astronautical Society with the Ordway Award for Sustained Excellence in Spaceflight History.