On Thursday, NASA announced that it was working with Russia’s space agency, Roscosmos, to understand a “new pressure signature” in a segment of the Zvezda service module. As a result, NASA and Axiom Space postponed the launch of the company’s fourth private mission to the ISS, which was scheduled for Wednesday, without setting a new date.

You don’t want to have more crew members up there if you’re losing a significant amount of air, because then, of course, you have more people trying to breathe."