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Jun 08, 2026
From Evacuation Alert to Normal Operations: The Zvezda Service Module Crisis
ISS Crew-12 members were initially ordered to evacuate into their SpaceX capsules due to escalating…
From Evacuation Alert to Normal Operations: The Zvezda Service Module CrisisThe International Space Station (ISS) has transitioned from a state of heightened alert to normal operations, following a decision by Nasa and Roscosmos to pause structural repairs on the Zvezda service module. The Crew-12 mission, comprising two US astronauts, a French astronaut, and a Russian cosmonaut, was initially ordered to enter their SpaceX Crew Dragon spacecraft and don spacesuits as a precautionary measure against a rapidly worsening air leak.The Escalation of the Zvezda CrisisThe decision to prepare for evacuation was driven by a significant increase in the rate of air leakage. While leaks had been monitored for months, the situation escalated dramatically on Monday when the leak rate doubled from one pound of air per day to two pounds (0.9kg) per day.Location of Issue: The leaks are located in the Zvezda service module's transfer tunnel, known as PrK.Root Cause: Structural cracks have been detected in the tunnel, a long-standing concern for Nasa and Roscosmos.Immediate Action: Roscosmos paused repairs to allow for data assessment, leading to the cancellation of the evacuation order.Quantifying the ThreatDespite the alarming nature of the evacuation order, officials emphasized that there was no immediate threat to the crew's safety. The leaks, which involved two separate oxygen leaks, were described as relatively minor in the broader context of the station's operations.Roscosmos reported that the first leak was quickly sealed, and preparations were underway to seal the second. The structural integrity of the football-pitch-sized laboratory remains a priority, with both agencies agreeing that the cracks require a more extensive repair operation than previously attempted.International Cooperation Under PressureThe incident highlights the delicate balance of international cooperation required to maintain the ISS. Nasa and Roscosmos have been debating the causes and fixes for the Zvezda module for months. The agency's spokesperson, Bethany Stevens, noted that the cracks have been mitigated as much as possible through operational measures, but the recent escalation necessitates a collaborative approach to ensure the long-term safety of the station.A Temporary Fix or Structural Failure?The return to normal duties offers a temporary reprieve, but the underlying structural issues in the Zvezda module remain unresolved. As the ISS ages, the frequency of such structural anomalies is likely to increase, requiring constant vigilance and international coordination to prevent future safety crises.
#International Space Station
#Nasa
#Roscosmos
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