NASA astronauts aboard the International Space Station (ISS) were ordered to prepare for a potential evacuation due to an air leak in the Zvezda service module. Five crew members were instructed to don spacesuits and retreat to their docked spacecraft as engineers worked to repair a cracked transfer tunnel. This precautionary measure, known as the 'safe haven' protocol, was lifted about two hours later, allowing the astronauts to return to the ISS. NASA spokesperson Bethany Stevens stated that the cracks in the Zvezda module have been a concern for some time and that mitigation measures have been implemented. NASA and its Russian counterpart, Roscosmos, are collaborating to identify the root cause of the leaks. Following new leaks, Roscosmos planned a more extensive repair operation but later paused it for further assessment. Despite the situation, Roscosmos assured that the crew's safety is not at risk, maintaining stable pressure aboard the ISS. Currently, there are seven astronauts on the station.