ISS Air Leak Forces Astronauts to Shelter, Repairs Paused June 06

Five astronauts aboard the International Space Station took shelter in a SpaceX Dragon spacecraft on June 5 after an air leak in the Russian Zvezda service module doubled to 2 pounds per day. NASA ordered the precaution as Roscosmos began structural repairs. The leak, first detected in 2019, has been classified as the station’s highest-level safety risk. Repairs were later paused and the crew returned to normal operations.

What Triggered the Emergency Shelter Order

The leak worsened during Progress 95 cargo operations the week of June 1. Roscosmos detected the rate had jumped to 2 pounds per day and identified new suspected leak areas in the PrK transfer tunnel. NASA directed four SpaceX Crew-12 members and astronaut Chris Williams to assume an elevated safety posture inside the Dragon spacecraft as Roscosmos prepared more extensive structural repairs. The decision reflected disagreement over repair methods between NASA and Roscosmos.

Repairs Halted, Crew Returns to Station

Roscosmos paused the structural repair work Friday morning in favor of additional measurements and data assessments. NASA strongly supported this decision. NASA provided an update on the leak confirming the crew ended safe haven procedures and returned to normal operations. Roscosmos reported two leaks were identified and one had already been sealed.

A Seven-Year Problem With No Permanent Fix

The PrK tunnel connects a docking port to the Zvezda service module and has suffered microscopic structural cracks since September 2019. The leak worsened over time, eventually reaching nearly 1 kilogram of air lost per day. Astronauts returned to the station after repairs were paused, but engineers have never fully solved the problem despite years of attempts. NASA and Roscosmos continue to apply temporary and permanent sealants as a management strategy.

Why This Matters for the Station’s Future

The ISS has been continuously occupied for over 25 years and has never experienced a full crew evacuation in its history. The 420-metric-ton station depends on cooperation between NASA and Roscosmos. Ongoing disagreements over repair methods highlight the technical and diplomatic challenges of maintaining a joint facility in orbit. The leak remains unresolved and requires continued monitoring.

Final Thoughts

The ISS leak emergency underscores decades-old structural problems with the Russian segment. While the immediate threat passed, the unresolved issue poses long-term risks to station operations and crew safety.

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