NASA has ordered its astronauts aboard the International Space Station to shelter inside their spacecraft and prepare for a potential evacuation as the Russian crew attempts to repair a worsening leak on its side of the station, the agency said Friday. The four Crew 12 astronauts—NASA’s Jessica Meir, Jack Hathaway, the European Space Agency’s Sophie Adenot, and Russian cosmonaut Andrey Fedyaev—received orders from mission control at 9:04 a.m. ET to don their spacesuits and enter their Crew Dragon spacecraft, a NASA official told Reuters. This will allow them to depart the space station quickly in the event that the leak warrants an emergency evacuation. The Zvezda service module transfer tunnel, known as PrK, has suffered from cracks and leaks for some time, and has been mitigated by Roscosmos as much as possible to date. The cracks have always been a concern that NASA watches very closely. NASA and Roscosmos have been working… — Bethany Stevens (@NASASpox) June 5, 2026 The Russian portion of the ISS, called the Zvezda service module, has long suffered from cracks and leaks. On Monday, the leaks escalated from a pound of air per day to two pounds, a senior NASA official told Reuters. This is a developing story and will be updated with new information.