WASHINGTON - A worsening air leak aboard the International Space Station prompted five astronauts to take shelter and prepare for evacuation for roughly two hours on Friday as Russia attempted to fix a crack on its portion of the orbital laboratory, NASA said.

The four astronauts of NASA's Crew-12 mission aboard the station - two Americans, a French astronaut and a Russian cosmonaut - along with another U.S. astronaut were ordered by NASA mission control at 9:04 a.m. ET (1304 GMT) on Friday to enter their SpaceX-built Crew Dragon spacecraft docked to the station, NASA spokesperson Bethany Stevens said.

NASA reversed that order roughly two hours later and told the astronauts they could return to the station as the agency and its Russian counterparts examined the rate of leaking air.

NASA and Russia's space agency Roscosmos, the station's two primary operators, have debated for months over the cause and potential fixes of small air leaks aboard Russia's Zvezda service module, a key structure of the ISS, a football field-size orbital laboratory where astronauts live and work in space.

Roscosmos said on Friday that its experts had detected two leaks aboard the ISS but that there was no immediate threat to the crew. The first leak was quickly sealed, and preparations were underway to seal the second one, Roscosmos said, adding that there was no threat to the spacecraft's systems.

The air leaks have been relatively minor in recent months but escalated on Friday from a pound of air per day to two pounds, according to a senior NASA official who asked not to be named.

The ISS is currently home to seven astronauts from two missions, including the Crew‑12 team - NASA astronauts Jessica Meir and Jack Hathaway, European Space Agency astronaut Sophie Adenot, and Roscosmos cosmonaut Andrey Fedyaev - who arrived in February.

The other crew of one U.S. astronaut, Christopher Williams, and two cosmonauts, Sergey Kud-Sverchkov and Sergei Mikayev, arrived in November.

Kud-Sverchkov and Mikayev, who did not execute evacuation procedures, were planning to use a saw to reach an area where they believe they can access the crack leaking air, the NASA official said. NASA officials disagreed with this method, the NASA official said, prompting mission control in Houston to order safe-haven procedures.

Stevens said NASA reversed the safe-haven order and told astronauts they could return the space station once Roscosmos paused its efforts to repair the crack. "We look forward to working with Roscosmos on a collaborative approach to address the leaks," she said.

Safe-haven orders are rare on the International Space Station, though pieces of space debris that risk colliding with the ISS and smaller changes in air leak rates have triggered the process in recent years. Astronauts have never had to evacuate the ISS in its 27 year history.

Legislation is before the U.S. Congress that would extend the planned life of the space station for two years, until 2032, to give companies more time to develop a replacement.

The bill has the backing of Senator Ted Cruz, a Republican, and Senator Maria Cantwell, a Democrat - the chair and ranking member, respectively, of the Senate Committee on Commerce, Science and Transportation. The legislation is part of the committee's focus on rivaling China's growing footprint in space.

Leaders in the U.S. Senate and House of Representatives are working to reach consensus on the proposed legislation.

(Reporting by Joey Roulette; Additional reporting by Karen Freifeld; Editing by Chizu Nomiyama, Joe Brock and Nick Zieminski)

FILE PHOTO: NASA’s Crew-12 members, Russian cosmonaut Andrey Fedyaev, NASA astronauts Jack Hathaway, Jessica Meir, and ESA astronaut Sophie Adenot walk out of the Operations & Checkout Building at the Kennedy Space Center before transport to Launch Complex 40, ahead of their launch to the International Space Station, in Cape Canaveral, Florida, U.S., February 13, 2026. REUTERS/Steve Nesius/File Photo Steve Nesius Reuters

FILE PHOTO: The International Space Station is seen with its full complement of solar arrays from the Space Shuttle Discovery during the STS-119 mission against the backdrop of the blackness of space and the Earth's horizon, in this image released by NASA March 28, 2009. REUTERS/NASA/File Photo NASA NASA Reuters

FILE PHOTO: A NASA photo shows a SpaceX Dragon capsule as it is released from the International Space Station in this image released to social media on May 11, 2016. Courtesy NASA/Handout via REUTERS/File Photo NASA NASA Reuters

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This story was originally published June 5, 2026 at 12:09 PM.

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