Fixing things in space isn't like grabbing a wrench from your garage. When something breaks 260 miles above Earth while you're moving at 28,000 kilometers per hour, a simple repair turns into a seven-hour surgical operation in a vacuum.
On Tuesday, June 30, 2026, NASA astronauts Chris Williams and Jessica Meir did exactly that. They stepped outside the International Space Station (ISS) to fix a glaring problem with the station’s iconic 58-foot-long robotic arm, Canadarm2. While mainstream news outlets love to focus on the mere spectacle of astronauts floating in space, they miss the real story here. This wasn't just a routine maintenance run. It was a high-stakes race against time to keep the aging laboratory functional before its scheduled retirement at the end of the decade.
Here is the real breakdown of what happened, what went wrong, and why this old piece of machinery is still absolutely vital.
The Surgery on Canadarm2
The whole mess started back on May 27, 2026. Mission controllers in Houston noticed something weird in the telemetry. One of the robotic arm's seven joints—specifically joint number five, the wrist joint—was drawing a massive amount of electric current but refusing to move.
If you've ever tried to force a jammed drill or a rusted bolt, you know what happens when an electric motor works too hard. It burns out. NASA and the Canadian Space Agency (CSA) spent weeks analyzing the data before making the call. The wrist joint was dead. It needed to be replaced.
Fortunately, Canadarm2 was built with modular, replaceable parts. The station already had a couple of 200-pound spare wrist joints bolted to an external storage platform. The problem was getting it off the shelf and onto the arm without dropping a multi-million dollar piece of hardware into the void.
Seven Hours in the Vacuum
Williams and Meir kicked off the year's third ISS spacewalk by switching their suits to battery power at 8:20 a.m. EDT. This marked the official start of U.S. Spacewalk 95.
The plan seemed simple on paper.
- Move to the external storage platform.
- Unbolt the spare 200-pound wrist joint.
- Remove the arm's "hand"—the latching end effector (LEE)—and a couple of healthy joints to get to the broken part.
- Swap the broken joint for the new one.
- Put everything back together.
But nothing in microgravity is simple. The assembly they had to remove and temporarily store on a nearby shelf weighed 900 pounds. Even though objects are weightless in orbit, they still have mass and inertia. Moving a 900-pound cluster of high-tech electronics while floating in a bulky spacesuit requires insane precision. One wrong push and the hardware can twist out of control or smash into the station's delicate hull.
Supported by fellow crewmates Jack Hathaway and Sophie Adenot, who positioned the arm from inside the station, Williams and Meir pulled it off. Roughly four and a half hours into the spacewalk, the new joint was securely bolted down. By the five-and-a-half-hour mark, they reattached the "hand" assembly.
The spacewalk ran longer than the initially planned six and a half hours, clocking in at 7 hours and 20 minutes by the time the airlock depressurized. But it was a total success. Mission Control powered up the arm and confirmed it now has two healthy strings of power and data running through its brand-new wrist.
Why We Cant Just Let the Arm Die
You might wonder why NASA is investing so much time and risk into repairing a machine that's been operating for over 25 years, especially when the ISS is slated for decommissioning in 2030.
The reality is that the ISS cannot survive without Canadarm2.
The arm acts as the station's ultimate multi-tool. It catches visiting cargo spaceships that don't have automatic docking systems. It moves heavy scientific payloads, relocates massive station modules, and even acts as a mobile cherry-picker to carry astronauts around during complex spacewalks. Without a fully functioning arm, the station is effectively crippled.
NASA managers have made it clear that there's no coasting to retirement. They're going to maintain full operational capabilities until the very day they push the station into the atmosphere.
What Happens to the Broken Pieces
The astronauts didn't just leave the broken 200-pound joint floating out there. Williams bagged the failed component and brought it back inside the Quest airlock.
It’s scheduled to catch a ride back to Earth on an upcoming cargo capsule. Once it lands, engineers will tear it apart to figure out exactly why the motor jammed and drew so much current. After a thorough cleanup and refurbishment, it will be launched right back up to the ISS to serve as a spare for the remaining years of the station’s life.
The Next Steps for the Crew
Now that the major heavy lifting is done, the work shifts back to the ground and internal station crews.
- Ground Testing: Over the next week, flight controllers in Houston and Canada will run Canadarm2 through a series of slow, highly choreographed movements to test its full range of motion.
- Tool Stowage: The crew will spend the next few days cleaning, inspecting, and recharging the spacesuits and pistol-grip tools used during the operation.
- Cargo Prep: Focus will soon return to preparing internal experiments and packing up trash and equipment for the next visiting vehicle rotation.
