NASA has raised concerns over a significant air leak in the Russian segment of the International Space Station (ISS), affecting astronauts including Sunita Williams and Butch Wilmore. The leak, located in the Zvezda service module, was first identified in 2019, and recent measurements show an increased leak rate. NASA has rated the issue as a top safety risk.
Current assessments indicate that the leak is losing approximately 1.7 kilograms of air per day. This marks a notable increase from earlier measurements. The leak is located in the Service Module Transfer Tunnel, which separates a docking port from the rest of the Zvezda module. This section can be sealed off to limit air loss.
Temporary repairs have been implemented by NASA and Roscosmos, including sealants and Kapton tape to cover cracks. Astronauts are currently staying on the American side of the ISS near emergency vehicles as a safety precaution. NASA has also coordinated with SpaceX to maintain an evacuation plan if needed.
The leak highlights the challenges of maintaining the aging ISS, particularly the Zvezda module, which has been in orbit since 2000. With the station planned for retirement by 2030, addressing structural integrity is a priority.
While the situation does not pose an immediate threat to crew safety, NASA and Roscosmos are actively monitoring and managing the air leak to prevent potential emergencies and ensure the continued safe operation of the ISS.