Overview
- The PrK transfer tunnel in Russia’s Zvezda module showed an increased air loss to about two pounds per day during Progress 95 cargo operations, and five crew members took a precautionary shelter inside the docked Crew Dragon on Friday, June 5.
- Roscosmos had proposed a more intrusive inspection that would cut a bracket to reach a suspected crack, a method NASA warned could raise structural risk, and Roscosmos then paused the cut to review additional data.
- After the pause the sheltered astronauts returned to normal station duties and NASA said it supports gathering more measurements and working with partners before proceeding with repairs.
- The PrK tunnel has leaked intermittently since cracks were first detected in 2019, and Roscosmos has repeatedly applied temporary and permanent sealants while teams try to find the root cause.
- The episode underlines how aging ISS hardware and limited on‑station evacuation options shape repair choices and international decision making as the station is managed toward its planned 2030 retirement.