On June 5 2026, NASA briefly ordered five astronauts aboard the International Space Station to shelter inside a docked SpaceX Crew Dragon capsule while Russian cosmonauts worked on a worsening air leak in the aging Zvezda service module. The shelter order, which NASA spokeswoman Bethany Stevens described as an abundance of caution, lasted only about two hours before it was lifted and the crew returned to normal operations. No one was in immediate danger, but the episode was the most serious air leak event on the station since 2020.

What actually happened on the ISS?

The five crew members who moved into the Crew Dragon were NASA astronauts Chris Williams, Jessica Meir, and Jack Hathaway, Russian cosmonaut Andrey Fedyaev, and French ESA astronaut Sophie Adenot. The leak sits in the Zvezda service module transfer tunnel known as PrK, the same Russian section that has been cracking and leaking for years. The rate of air loss had spiked from its usual one pound per day to two pounds, which is what triggered the more aggressive repair attempt. Roscosmos sealed one of two leaks found during the June 5 inspection using a repair compound, then paused work on the second so engineers could study fresh pressure data.

Why does the ISS keep leaking?

The leaks were first detected back in 2019, always on the Russian segment, and crews have patched them over the years with tape, glue, and sealant. The Zvezda module is the oldest Russian contribution to the station, and the cracks have never been fully solved. NASA and Roscosmos still have not pinned down the root cause. This slow structural decay is one of the reasons the partners plan to retire the station by 2030, and Elon Musk has publicly argued for deorbiting it even sooner, by 2027.

Should anyone be worried?

Not in the panic sense. The crew was never in real jeopardy, and a two hour shelter order on a vehicle that is already docked and ready is exactly the kind of conservative call you want from flight controllers. The bigger story is what it represents. The ISS is past 25 years in orbit, it is held together in places by patches, and every incident like this is a reminder that the outpost is running on borrowed time. The interesting question is not whether this leak gets fixed. It is what replaces the station once the lights finally go out.

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