The delayed launch of Axiom 4 to the International Space Station will have to wait a little bit longer. The company announced today that the “space agency needs additional time to continue evaluating International Space Station operations after recent repair work in the aft (back) most segment of the orbital laboratory’s Zvezda service module.”

The delay is labeled as “indefinite” and no new launch target date has been announced.

The crew remains in quarantine, and the Falcon 9 and Crew Dragon planned for the flight remain in healthy condition and ready for the flight.”

The root cause of the delay is a series of micro-leaks in the Zvezda module, first detected months ago but considered under control after previous repair efforts. However, on June 14, cosmonauts aboard the ISS noted a fresh pressure signature in the aft segment of Zvezda, indicating that some seals may have degraded or reopened under flight conditions. Although the module has held pressure more consistently since the latest inspections, NASA and its Russian partners determined that more data were needed to rule out any risk to incoming crew.

On a blog update published last week, NASA detailed the troubleshooting steps taken by cosmonauts: interior surfaces were inspected, suspect seals were re-torqued, and additional leak-rate measurements were conducted. “Following the most recent repair, pressure in the transfer tunnel has been stable,” NASA wrote, “but additional time is required for Roscosmos and NASA to evaluate whether further action is necessary.” This review window now overlaps with the Monday launch opportunity, effectively ruling it out until the investigation concludes.

There are also ISS logistics to consider: Ax-4’s launch window is tightly constrained by orbital mechanics and ISS traffic. The current opportunity closes on June 30 to accommodate other scheduled resupply and crewed flights. Pushing through before fully resolving the leak could risk mission safety and station integrity, particularly given the interconnected life-support systems aboard the ISS. Axiom Space President Michael Suffredini emphasized that while commercial missions must adhere to tight timelines, safety remains the non-negotiable priority.

Stay tuned.