International Space Station Leak Crisis Escalates, Forcing Astronaut Shelter-in-Place and Hatch Decommissioning Plans
The long-running air leak crisis aboard the International Space Station (ISS) reached a critical juncture in June 2026, resulting in a high-tension standoff between NASA and Russia’s Roscosmos, an emergency crew shelter-in-place order, and plans to permanently decommission a portion of the station.
June 5, 2026: Emergency Shelter-in-Place
On June 5, 2026, the air leak in the Russian segment of the station—specifically within the PrK (transfer vestibule/chamber) connecting a docking port to the Russian Zvezda service module—worsened significantly.
In preparation for a highly risky repair attempt planned by Roscosmos, NASA ordered its five orbital segment crew members to take emergency shelter inside the docked SpaceX Crew Dragon spacecraft. The emergency shelter-in-place order was triggered by Roscosmos' plan to use a saw to cut away a load-bearing bracket in the Zvezda module to gain better access to the microscopic cracks. NASA strongly disagreed with the saw-cutting strategy, warning that the operation "could have resulted in elevated risk to the structure in the area." Following the crew safety alert and NASA's opposition, Roscosmos postponed the cutting operation.
Russia Prepares to Decommission the PrK Vestibule
Following the standoff and ongoing technical deliberations, reports in mid-June 2026 revealed that Russia has decided to throw in the towel on repairing the persistent cracks, which have been leaking air since September 2019. Instead, Roscosmos has informed NASA that it intends to permanently decommission the PrK module.
This decommissioning will involve permanently sealing the hatch connecting the Zvezda service module to the PrK vestibule. While permanently closing the hatch will successfully isolate the leak and stop the loss of precious cabin air, it carries major operational consequences:
- Loss of Docking Port: Closing the hatch permanently cuts off access to the docking port at the end of the Zvezda module, which is primarily used by Russian Progress cargo spacecraft.
- Supply and Orbit-Raising Limitations: Roscosmos will be forced to rely on other, less convenient docking ports to transfer supplies to the ISS and will face restrictions on conducting orbit-raising propulsion burns, which are typically performed by docked Progress vessels at the Zvezda aft port.
This development marks the most severe structural compromise of the aging orbital outpost to date as it approaches its planned retirement.
"For seven years, tiny cracks in the International Space Station (ISS) have been leaking air. NASA and its Russian counterpart, Roscosmos, have deliberated over ways to fix the air leaks, but nothing seems to work. After a risky plan prompted the ISS astronauts to seek emergency refuge, Russia’s space agency may finally throw in the towel." — Gizmodo, June 2026
"Ahead of the latest attempt to repair the leak, Russian officials informed NASA of their plan to use a saw to gain better access to the crack leaking air in the Zvezda module’s transfer tunnel. NASA disagreed with this strategy, stating that it 'could have resulted in elevated risk to the structure in the area.'" — Gizmodo, June 2026