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The air leak in the Russian-operated segment of the International Space Station originated in the Zvezda service module’s transfer tunnel, or PrK.
The Zvezda service module’s PrK has had intermittent cracks and minor air leaks since 2019.
Roscosmos will conduct a more extensive repair operation on the Zvezda transfer tunnel on Friday, June 5, 2026.
Roscosmos has mitigated the Zvezda service module transfer tunnel cracks and leaks through operational measures and periodic partial repairs.
One of the Zvezda transfer chamber leak sites was sealed with the two-component sealant Germetel-1.
The Zvezda service module transfer tunnel on the International Space Station, known as PrK, has had cracks and leaks for some time.
The air leak affected the Zvezda service module of the International Space Station.
Roscosmos manages the Zvezda transfer tunnel crack issue through operational mitigation measures and periodic partial repairs.
Roscosmos planned a more extensive repair operation on the Zvezda service module transfer tunnel for Friday, June 5.
The Intermédiaire Chamber (PrK) is the small space at the rear of the Zvezda module that gives access to the docking compartment used by Progress spacecraft.
The Zvezda service module transfer tunnel, known as PrK, has had cracks and leaks for some time.
NASA and Roscosmos have been working to determine the root cause of the cracks in the Zvezda service module transfer tunnel.
Roscosmos paused the Friday structural repair efforts inside the Zvezda service module transfer tunnel while it assessed more measurements and data.
The second Zvezda transfer chamber leak site is located on the conical portion of the transfer chamber and is being prepared for sealing.
The Zvezda transfer chamber leaks pose no threat to the safety of the crew or the International Space Station's onboard systems.
The Zvezda service module transfer tunnel on the International Space Station has had cracks and leaks for some time.
Specialists found two air leaks in the Zvezda module of the Russian segment of the International Space Station during pressurization of the module's transfer chamber.
Roscosmos planned a more extensive repair operation inside the Zvezda service module transfer tunnel on Friday, June 5.
Roscosmos later paused the structural repair efforts inside the Zvezda service module transfer tunnel, and NASA instructed the crew members in Dragon to end safe haven procedures and return to planned operations aboard the International Space Station.
Roscosmos has mitigated the cracks and leaks in the Zvezda service module transfer tunnel through operational measures and periodic partial repairs.