AviationNews – On Friday, NASA officially ordered five of the seven crew members aboard the International Space Station to shelter inside a docked spacecraft and prepare for a potential emergency evacuation due to a rapidly accelerating air leak in the Russian segment. The directive highlights an escalation in a long-standing structural vulnerability that now presents a primary safety concern for the orbiting laboratory.
The critical situation stems from a persistent issue inside the PrK vestibule, a transfer tunnel connecting a docking port to the Russian Zvezda service module. While technicians initially believed they had achieved a stable pressure configuration earlier this year, a sharp pressure drop was detected on May 1, immediately following the arrival and unloading of a Progress cargo spacecraft. Air loss rates from the microscopic cracks have recently fluctuated between one and two pounds per day, prompting mission controllers to elevate the technical risk to its highest level.
To protect the crew from sudden decompression, NASA activated a “safe haven” protocol, directing members of the SpaceX Crew-12 mission to don their specialized pressure suits and wait inside the attached Crew Dragon Freedom capsule. This mechanical positioning guarantees the crew can immediately isolate themselves and initiate a departure sequence back to Earth if structural integrity fails. Concurrently, two Russian cosmonauts remain outside the safe haven zone, executing high-stakes manual repairs utilizing advanced mechanical patches and chemical sealants to isolate the fracture points.
“Out of an abundance of caution, NASA directed the crew members to wait inside the docked spacecraft while others repaired a leak,” an agency representative confirmed in an official statement regarding the active emergency protocol.
The incident accentuates the physical decay of the aging space station, which is officially scheduled for retirement in 2030 after nearly three decades in low-Earth orbit. Ground teams at both NASA and Roscosmos are continuously evaluating real-time atmospheric sensor data to measure the effectiveness of the current patching operation. If the sealants fail to stabilize the pressure drop, management may be forced to permanently seal off the affected Russian transfer tunnel, limiting future docking capabilities.
NASA continues to monitor the developing situation while astronauts remain on standby inside the return capsule. The successful application of the latest structural patches will determine whether the station can safely resume normal operations. Ultimately, this technical crisis underscores the growing operational difficulties of maintaining human presence in space using aging orbital hardware.
