The June 5 Standoff: Saws and Shelter
The tension aboard the International Space Station peaked when Roscosmos officials informed NASA of a plan to use a drill and a drill stop
—a device meant to prevent the bit from punching entirely through the module wall—to address structural cracks. According to WION, NASA officials were unsettled by the lack of detailed analysis supporting the procedure.
The situation escalated Friday morning when Russian cosmonauts Sergey Kud-Sverchkov and Sergei Mikaev approached the PrK module with a saw, intending to remove a load-bearing bracket. NASA mission controllers in Houston reported that Roscosmos began ignoring communications during this maneuver.
We threatened we would put astronauts in suits, in Dragon, to send a message to the world that we disagreed. They didn’t care.
NASA official, via Ars Technica
NASA followed through on the threat, directing the following crew members to take shelter inside the SpaceX Crew Dragon Freedom spacecraft:
This move, described by press secretary Bethany Stevens as being done out of an abundance of caution
, effectively forced Roscosmos to stand down. The cosmonauts abandoned the saw and instead applied sealant to one of two suspected leak areas.
The PrK Module’s Seven-Year Leak
The conflict centered on the PrK, a short transfer tunnel that connects the Russian Zvezda module to the station’s aft docking port. This section is essentially a tube within a tube, traversing an unpressurized equipment bay. As Yahoo reports, the area has suffered from intermittent air leaks since September 2019.
The leaks are the result of microscopic structural cracks caused by corrosion. These fissures expand and contract as cabin pressure cycles, creating a persistent vulnerability in the station’s pressure vessel. By early June 2026, the total number of identified cracks had reached approximately 16.
The degradation has accelerated over time. Data reported in 2024 indicated the leak rate had doubled, increasing from one pound of air per day to slightly over two pounds. While the station’s life support systems can compensate for this loss, the trend signaled a growing structural risk that NASA eventually elevated to the highest risk level.
Decommissioning the Transfer Tunnel
Following the June standoff, NASA and Roscosmos reached an agreement to stop attempting repairs. According to eciks.org, Russia will now decommission the PrK module entirely.
Decommissioning means the module will no longer be pressurized, and cosmonauts will be prohibited from entering the tunnel. This effectively seals the leak from the rest of the station, removing the immediate threat of gradual atmosphere loss.
The decision imposes several operational constraints:
While this resolution preserves the peace between the two agencies, it marks the surrender of a key piece of the station’s infrastructure.
The Risk of Catastrophic Structural Failure
The disagreement over the use of a saw was not merely a procedural dispute; it was a clash over the physics of a failing pressure vessel. NASA’s fear was that removing a load-bearing bracket from a corroded module could trigger a sudden, violent failure.
As Gizmodo notes, there were concerns that the PrK module could unzip
—a catastrophic failure where a crack propagates rapidly, leading to an immediate and total depressurization of the connected modules. Retired NASA official Bob Cabana had previously highlighted these concerns regarding the structural integrity of the PrK.
So, yeah, worst case, you could seal it off, and I think the Space Station could continue. But of course, you never know what other problems might arise.
Andreas Mogensen, ESA Astronaut, via The Register
The decision to seal the module is a pragmatic admission that the Zvezda module is showing its age after more than two decades in orbit. By treating the PrK as a lost cause, NASA and Roscosmos have traded a functional docking tunnel for the safety of the remaining crew. With the ISS entering its final years of operation, the priority has shifted from maintenance to survival.





