NASA's ISS astronauts briefly sheltered today. Here's what happened.

NASA astronauts briefly sheltered in their SpaceX Crew Dragon capsule on Friday during a Russian repair attempt on a leaky transfer tunnel of the International Space Station. 

The work was later halted for further analysis, and the crew resumed their normal tasks on the space station, which orbits about 250 miles above Earth.

The cracks in the Zvezda service module's transfer tunnel, known as PrK, are the latest sign of aging infrastructure at the 26‑year‑old outpost, which has already weathered a separate coolant leak on a docked Soyuz spacecraft. These incidents have forced NASA and Russia's Roscosmos space agency to coordinate on protecting the crew and keeping the station operational.

The PrK tunnel on Russia's Zvezda service module "has suffered from cracks and leaks for some time, and has been mitigated by Roscosmos as much as possible to date," NASA press secretary Bethany Stevens said in a statement on X. She said the cracks "have always been a concern that NASA watches very closely."

New leaks led Roscosmos to start a more extensive structural repair on June 5, prompting NASA to direct the four Crew‑12 astronauts — Jessica Meir, Jack Hathaway, Russia's Andrey Fedyaev, and Europe's Sophie Adenot — and NASA's Chris Williams, who flew to the space station separately in November 2025, to take shelter inside the Dragon capsule as a safety precaution. 

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In an update about one hour later, Stevens said Roscosmos had paused the repair effort to take measurements and assess the data. With hands‑on work interrupted, NASA told the crew they could go back to business as usual.

"We continue to work with our Russian counterparts, along with the rest of the international community that supports the space station, to arrive at a more permanent resolution," she said, adding that NASA intends to work with Roscosmos on a collaborative approach to address the leaks.

In a separate incident involving different hardware about 3.5 years ago, NASA and Roscosmos juggled a coolant leak on the Soyuz MS‑22 spacecraft docked to the station, which investigators attributed to a likely micrometeoroid strike on an external radiator line. Russia launched a replacement Soyuz to get the crew home. 

NASA plans to operate the space station through 2030 before deorbiting it into the Pacific Ocean, while Roscosmos has committed to the partnership until at least 2028. Both agencies plan to transition to new destinations.