NASA orders astronauts aboard the International Space Station (ISS) to prepare for a possible evacuation after a worsening air leak develops on the station. Multiple outlets report that the situation escalates in the ISS’s Russian segment, where the Russian crew is attempting to address the leak. NASA’s action includes placing the crew on evacuation alert, indicating contingency steps are being readied should conditions deteriorate further or repairs prove insufficient. The reporting describes the leak as worsening, prompting increased urgency and additional preparations by the crews who operate the orbiting laboratory. While the outlets emphasize that NASA is treating the leak as a potential safety concern, they also note ongoing efforts by the Russian crew to fix the problem. The ISS remains in orbit during these preparations, with teams coordinating maintenance and troubleshooting responses in space while following emergency procedures. The exact cause of the leak and the status of repair efforts are not detailed in the provided summaries.