Air Leak Prompts Shelter-in-Place Order on ISS
A sudden increase in air leakage aboard the International Space Station (ISS) led to astronauts being instructed to take shelter in an attached spacecraft. On Friday afternoon, five of the seven crew members were directed to enter the docked SpaceX Dragon capsule named "Freedom" as a precautionary measure, preparing for a possible evacuation.
Meanwhile, two Russian cosmonauts remained on the ISS attempting to repair the source of the leak in the Russian segment, where air loss had been escalating since Monday.
These repair efforts were temporarily halted, and NASA ordered the crew back onto the station later that day.
Jessica Meir, Jack Hathaway, Sophie Adenot, and Andrey Fedyaev, who arrived at the ISS in February, had been sheltering inside the Dragon spacecraft along with astronaut Chris Williams. They were instructed to don their spacesuits to be ready for an immediate undocking and return to Earth if necessary.
The Dragon spacecraft serves as a lifeboat, remaining docked to the ISS but capable of rapid detachment upon command.
Leak Origin and Repair Attempts
The air leak was traced to the transfer tunnel known as PrK, which connects to the Zvezda service module, a section of the Russian segment of the station. Russian cosmonauts and ISS commander Sergey Kud-Sverchkov, along with flight engineer Sergei Mikaev, undertook efforts to repair the leak. Their designated escape vehicle was the separately docked Soyuz MS-28 spacecraft.
This is not the first occurrence of such an issue; the cracks causing the leaks have been an intermittent problem for approximately six years.
Following the arrival of a Russian cargo ship last month, the Russian space agency Roscosmos detected a new slow pressure drop in the tunnel. This development prompted a decision to move beyond temporary fixes and attempt a more comprehensive repair operation on Friday.
Disagreement Over Repair Method and Safety Measures
According to , the repair method involved the use of a saw by Kud-Sverchkov and Mikaev to access the area containing the crack. NASA expressed concerns over this approach, leading mission control in Houston to order five crew members to initiate "safe-haven" procedures aboard the Dragon spacecraft.
When Roscosmos instructed their crew to pause the repairs, NASA directed the astronauts to return to the ISS.
"Given this development, Nasa has instructed the crew members inside the Dragon spacecraft to end the safe haven procedures and return to planned operations aboard the International Space Station,"said NASA spokeswoman Bethany Stevens on X.
Russian news agency Tass, citing Roscosmos, reported that the situation did not pose a threat to the safety of the crew or the ISS's onboard systems.
About the International Space Station
The ISS, which measures roughly the length of a football field, is the largest human-made object in space. It has been continuously operated since 1998 by a consortium led by the United States and Russia, with participation from Canada, Japan, and 11 European countries.
