All modules of the Russian segment are exhausted
High above the Earth, the machinery of human cooperation is showing its age. This week, the Russian segment of the International Space Station lost its primary oxygen supply in the Zvezda module — a 20-year-old component designed to last 15 years — joining a growing list of failures that include an unresolved air leak, a broken toilet, and unexplained temperature spikes. The six crew members aboard faced no immediate danger, as the American segment's backup oxygen system held firm, but the incident raises a quiet and pressing question: how long can a partnership built on complementary systems endure when one side is quietly wearing out?
- The Zvezda module's oxygen system failed just as three new crew members arrived, spiking life-support demand at the worst possible moment.
- The failure is not isolated — the same module is leaking air at an elevated rate, a breach that began in 2019 and still has no confirmed location.
- Cosmonaut Gennady Padalka stated plainly that all Russian segment modules are 'exhausted,' a candid admission that the hardware has simply outlived itself.
- The crew remains safe for now, sustained by the American segment's backup oxygen and onboard emergency reserves — redundancy doing exactly the job it was designed to do.
- With SpaceX's Crew-1 mission already delayed and the leak unresolved, the question of the Russian segment's long-term viability has shifted from theoretical to operationally urgent.
The International Space Station's Russian segment lost its primary oxygen supply this week, centered in the Zvezda service module — a 20-year-old structure that houses crew quarters, life support, and the kitchen and bathroom systems for the Russian side of the station. The six people aboard, including NASA astronaut Kate Rubins who had just arrived with two colleagues, were never in immediate danger. The American segment's backup oxygen system was operating normally, and emergency reserves provided an additional layer of protection.
But the failure carries weight beyond the technical. Zvezda launched in 2000, and the broader Russian segment includes hardware dating to 1998 — all of it well past the station's original 15-year design life. The oxygen failure is only the latest in a string of problems concentrated in this single module: a toilet breakdown, unexplained temperature rises, and a persistent air leak that began in September 2019 and has yet to be traced to its exact source. By late 2020, investigators had narrowed the leak to Zvezda itself, though NASA said the two issues appeared unrelated.
Roscosmos confirmed the failure but offered few details on cause or repair timeline. A spokesperson assured the public that crew safety was not at risk. Cosmonaut Gennady Padalka offered a starker view, telling a Russian state news agency that all modules of the Russian segment are simply 'exhausted.'
The station was designed as a complementary partnership — American and Russian systems built to back each other up. That redundancy worked this week. But as the Russian modules age beyond their intended lifespan, the deeper concern is not any single failure, but how many the partnership can absorb before the balance of resilience tips toward something more precarious.
The International Space Station's Russian segment lost its primary oxygen supply this week, marking another crack in infrastructure that was never meant to last this long. The failure occurred in the Zvezda service module, a 20-year-old component that has become the backbone of the Russian side—housing the crew quarters, kitchen, bathroom, and life-support systems that keep cosmonauts alive. But the six people aboard the station, including NASA astronaut Kate Rubins who arrived with two other crew members just as the system went down, faced no immediate danger. The ISS carries a second oxygen system on its American segment, and both agencies confirmed it was operating normally. The station also maintains emergency oxygen reserves as a final safeguard.
Yet the timing and context of this failure tell a larger story about the aging orbiting laboratory. The Zvezda module launched in 2000, part of a Russian segment that includes even older hardware—the Zarya Control Module, which has been in orbit since 1998. The entire International Space Station was designed with a 15-year operational lifespan. It has now far exceeded that window, and the Russian side is showing the strain.
This oxygen system failure is not an isolated incident. In recent months, the Zvezda module has become a source of recurring problems. A toilet broke down, though it was later repaired. Temperatures in the module rose unexpectedly, for reasons that remain unclear. And most persistently, an air leak has been slowly draining the station's atmosphere at a rate higher than normal. The leak began in September 2019, but crew members only began a serious search for its source over the summer of 2020. By September, investigators had narrowed the problem to the Zvezda module itself, though they still haven't located the exact breach. NASA officials said they saw no connection between the leak and the oxygen system failure, but the pattern is unmistakable: one module, multiple systems failing.
The Russian space agency Roscosmos confirmed the oxygen system failure but offered little detail about its cause or timeline for repair. A Roscosmos spokesperson told the AFP that nothing threatened crew safety or the station's integrity. But cosmonaut Gennady Padalka, speaking to Russian state news agency Ria Novosti, was more candid about the broader problem. "All modules of the Russian segment are exhausted," he said—a blunt assessment that the hardware has simply worn out.
The oxygen system failure also arrived at a moment of operational complexity. The station's population had just grown to six with the arrival of three new crew members, increasing demand on life-support systems at the precise moment one of them stopped working. SpaceX's Crew-1 mission, the company's first official crewed flight for NASA, had already been delayed, and the air leak appears to have played a role in that decision. Now, with the oxygen system down and the leak still unfixed, the question of how long the Russian segment can sustain operations without major upgrades has moved from theoretical concern to practical urgency.
The ISS was built as a partnership between nations, with the American and Russian segments designed to be complementary. The redundancy that kept the crew safe this week—the backup oxygen system on the US side—is exactly the kind of insurance that makes the station resilient. But redundancy works only if both sides remain functional. As the Russian modules age past their design life, the question is no longer whether they will fail, but how many failures the station can absorb before the partnership itself becomes unsustainable.
Citações Notáveis
All modules of the Russian segment are exhausted— Cosmonaut Gennady Padalka, to Ria Novosti
Nothing threatens the security of the crew and the ISS— Roscosmos spokesperson, to AFP
A Conversa do Hearth Outra perspectiva sobre a história
When the oxygen system failed, what exactly stopped working? Was it a sudden rupture, or did it just gradually lose pressure?
The reports don't specify the exact mechanism—whether it was a valve, a pump, or something else. What we know is that the Zvezda module's oxygen supply system simply stopped functioning. The crew noticed it, reported it, and within hours they confirmed the backup system was fine.
So the crew wasn't scrambling? They knew they had a safety net?
Exactly. This is why redundancy matters in space. The moment they lost the Russian system, they had the American one. But it does raise a question: what happens if both systems fail? The station keeps emergency oxygen reserves, but you're now operating on borrowed time.
You mentioned the air leak has been going on for over a year. Could that be connected to the oxygen system failure?
NASA says no, and they may be right. But both problems are in the same module, the same 20-year-old piece of hardware. It's like an old house where the roof leaks and the furnace breaks in the same winter. They might not be directly related, but they're symptoms of the same underlying issue: age.
What does "exhausted" mean when a cosmonaut says the modules are exhausted?
He means they've been used beyond their intended lifespan. These modules were built to last 15 years. We're now at 20, 22 years for some of them. Every system—the seals, the pumps, the wiring—has been cycling longer than engineers planned for. Things start failing not because of a single catastrophic event, but because materials degrade.
Is the station in danger of being abandoned?
Not immediately. But the pattern is clear: the Russian side needs serious investment in upgrades or replacement modules. Right now, the partnership is holding because the American segment is newer and more reliable. But if the Russian side deteriorates faster, it changes the calculus of whether the station remains viable.