Engineers from NASA and Roscosmos have been investigating the cracks through a joint commission, attempting to isolate their origin. Despite progress, the teams have not converged on a single explanation. \u201cThe joint commission noted that NASA and Roscosmos technical teams have made significant progress in understanding the root cause and mitigations of cracking in the PrK,\u201d Advisory Council chairman Bob Cabana said. Yet the same assessment acknowledges they \u201chad failed to identify a single root cause.\u201d<\/p>\n
Two leading theories dominate the investigation. One points to high-cycle fatigue caused by persistent vibrations from onboard pumps. The other considers environmental-assisted cracking, where prolonged exposure to the harsh conditions of space weakens materials over time. Each hypothesis carries different implications for how widespread the issue could be across the station. Without clarity, engineers are left managing risk rather than eliminating it.<\/p>\n
![\"Image\"](\"https:\/\/www.newsbeep.com\/us\/wp-content\/uploads\/2026\/05\/image-60.png.webp.webp\")
A diagram showing the on-orbit configuration of the\u00a0Zvezda Service Module\u00a0of the\u00a0International Space Station. Credit: NASA<\/p>\n
Conflicting Assessments Between NASA And Roscosmos<\/p>\n
The situation is further complicated by differing interpretations between the U.S. and Russian teams. While both agencies agree on mitigation strategies, such as limiting pressure inside the vestibule and restricting access, there is no consensus on how dangerous the cracks truly are. This lack of agreement has persisted across multiple advisory meetings and continues to shape operational decisions aboard the ISS.<\/p>\n
\u201cThe NASA team continues to have concerns over the length of time that the PrK remains at pressure,\u201d Bob Cabana, the chairman of the committee, noted, highlighting ongoing unease about how the module is being used. Reports indicate that protocols established to reduce internal pressure are not consistently followed, prompting additional analysis and debate between teams.<\/p>\n
This divergence is not just technical; it reflects broader operational tensions in managing a shared orbital laboratory. Decisions about how often to use the docking port, how long to keep it pressurized, and whether to rely on alternative docking locations all hinge on interpretations of incomplete data. The result is a cautious, sometimes fragmented approach to station operations.<\/p>\n
Leak-Free Does Not Mean Risk-Free<\/p>\n
From a purely operational standpoint, the absence of active air leaks is a major relief. \u201cThe current position right now is there are no leaks,\u201d said Joel Montalbano, acting associate administrator for space operations, during a congressional hearing. \u201cThey\u2019ve put some sealant over it and we\u2019re not leaking.\u201d<\/p>\n
Yet this success does not resolve the underlying structural concern. The vestibule is still treated as a potential hazard zone. When it is in use, crew members from the U.S. segment remain isolated, with hatches closed as a precaution. The time the module spends pressurized is minimized, and mission planners are actively exploring alternative docking strategies to reduce reliance on the affected port.<\/p>\n