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NASA Orders ISS Crew to Hunker Down in SpaceX Capsule During Worsening Russian Module Leak

Photo Courtesy of International Space Station / Facebook | Uploaded: May 17, 2026

NASA Mission Control ordered five International Space Station astronauts to don spacesuits and take shelter inside a docked SpaceX Crew Dragon spacecraft on June 5, 2026, following a dangerous acceleration of a long-standing air leak on the Russian-controlled side of the orbiting outpost. The precautionary "safe haven" directive was given at 9:04 a.m. ET as Russian cosmonauts began a high-stakes, extensive structural repair on the aging Zvezda service module. The emergency posture was safely canceled after roughly two hours when Russia's space agency, Roscosmos, elected to pause the repairs to re-evaluate structural data.

Spiking Leak Rates Trigger Emergency Protocol

The sudden disruption stemmed from a sharp increase in environmental atmospheric loss inside the PrK transfer tunnel, a critical vestibule located on the back end of the Russian Zvezda module that connects to incoming Progress resupply ships. While engineers from both space agencies have tracked microscopic cracks in this tunnel since 2019, the leak rate spiked dramatically. The rate expanded from a baseline loss of roughly one pound of air per day to a severe two pounds of air per day, forcing aggressive intervention.

As Russian cosmonauts prepared to execute an invasive structural repair operation to patch two newly found micro-cracks, NASA prioritized crew safety by executing emergency contingency protocols.
Two Hours in the "Safe Haven"

The shelter order directly impacted five of the station's residents:

SpaceX Crew-12: Four international crew members (two Americans, one French astronaut, and one Russian cosmonaut) who arrived at the outpost in February 2026.

Soyuz Crew Addition: NASA astronaut Chris Williams, who launched to the station via a Russian Soyuz vehicle in late 2025.

The five crew members crammed into the 13-foot-wide SpaceX Dragon capsule—the designated emergency escape vessel for the Crew-12 team—and closed the hatches to isolate themselves from the rest of the station. Had the repair gone wrong or caused a catastrophic hull failure in the Zvezda module, the astronauts were positioned to immediately undock and return to Earth.

Structural Concerns and Disagreement Over Station Future

The incident concluded without injury or depressurization after NASA Spokesperson Bethany Stevens confirmed that Roscosmos paused its repair efforts.

"Roscosmos has paused structural repair efforts inside the Zvezda service module transfer tunnel... as more measurements and data is assessed," Stevens stated on the social media platform X. "Given this development, NASA has instructed the crew members inside the Dragon spacecraft to end the safe haven procedures and return to planned operations."

Despite the stand-down order, the episode underscores a widening safety rift between international partners. While Roscosmos quick-released official updates stating that onboard system pressure is nominal and the crew faces "no immediate threat," NASA remains deeply concerned. The U.S. space agency previously elevated the Zvezda module cracks to its highest level of internal risk assessment.

As the International Space Station approaches its final scheduled retirement in 2030, structural micro-fissures caused by environmental stress, thermal expansion, and mechanical fatigue continue to raise valid doubts about whether the 25-year-old laboratory can safely survive the decade.


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