Russian cosmonauts attempted repairs but paused efforts after NASA reported a critical air leak in the ISS’s Zvezda module transfer tunnel. Five of seven crew members sheltered inside the SpaceX Dragon capsule as engineers on Earth assessed the situation. The leak, caused by long-standing cracks in the PrK tunnel, has disrupted operations since 2019, prompting recurring emergency protocols.

NASA spokesperson Bethany Stevens confirmed partial operations resumed after Russian engineers halted repairs to gather data. The Zvezda module’s leaks—known to cause sporadic issues for six years—have been temporarily fixed with patchwork solutions. Officials now plan a more extensive overhaul to eliminate the problem permanently, though no timeline exists for the mission.

The incident underscores ongoing collaboration between NASA and Roscosmos to address aging infrastructure aboard the station.Long-term repairs remain urgent, as the tunnel’s deterioration risks crew safety and mission continuity. ISS operations depend on timely fixes, but delays highlight vulnerabilities in multinational space partnerships. The incident also raises questions about relying on commercial spacecraft like SpaceX Dragon as emergency shelters, a role they’ve assumed since 2020.

While the leak temporarily grounded routine activities, the station’s systems remain stable. Future repairs will likely involve replacing the tunnel’s structure—a complex task requiring coordinated launches. This crisis reiterates the challenges of maintaining a permanently crewed orbiting laboratory with aging components and overlapping international responsibilities.