Five astronauts aboard the International Space Station took shelter and prepared for a possible evacuation for about two hours Friday after an air leak worsened as Russia tried to repair a crack in its section of the station, NASA said.
NASA mission control ordered the four astronauts on NASA’s Crew-12 mission and another U.S. astronaut into their SpaceX Crew Dragon spacecraft at 9:04 a.m. EDT, NASA spokesperson Bethany Stevens said. About two hours later, NASA told them they could return to the station while NASA and Russia’s Roscosmos reviewed the leak rate.
Roscosmos said Friday that its experts had detected two leaks aboard the station but that there was no immediate threat to the crew. It said one leak was quickly sealed and preparations were underway to seal the second. Roscosmos also said there was no threat to the spacecraft’s systems.
A senior NASA official said the leak rate increased Friday from 1 pound of air a day to 2 pounds.
The station has seven astronauts from two missions. Crew-12 includes 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 — U.S. astronaut Christopher Williams and cosmonauts Sergey Kud-Sverchkov and Sergei Mikayev — arrived in November.
The NASA official said Kud-Sverchkov and Mikayev, who did not follow evacuation procedures, planned to use a saw to reach an area where they believed they could access the crack. The official said NASA objected to that approach, prompting mission control in Houston to order safe-haven procedures.
Stevens said NASA lifted the order after Roscosmos paused its repair work.
Safe-haven orders are rare on the station, though space debris risks and smaller changes in leak rates have prompted them in recent years. Astronauts have never had to evacuate the International Space Station in its 27-year history.