Russian cosmonauts are attempting to permanently seal ongoing leaks in the Zvezda module’s transfer tunnel. These microscopic cracks have steadily worsened atmospheric pressure. Due to disagreements over the intense repair methods, NASA briefly ordered crew members to shelter in the Crew Dragon spacecraft as a safety precaution.
The situation has escalated due to specific technical, operational, and structural complications:
- The Problem Area: The structural degradation is isolated to the PrK transfer tunnel, a small airlock connecting the main Russian Zvezda module to the aft docking port used by Progress cargo spacecraft.
- Escalating Leak Rates: The microscopic structural cracks and welded joint failures have plagued the station since at least 2019. By early June 2026, total cracks grew to approximately 16, pushing daily air loss up from one pound to two pounds.
- Disputed Repair Methods: The Russian space agency, Roscosmos, proposed utilizing heavy drills and saws in the pressurized compartment to gain physical access. Deeply concerned about this strategy, NASA instructed five astronauts to establish an emergency safe haven inside the docked Dragon capsule until conditions were stabilized.
- Current Status: After fixing one of the leaks with sealants, the Russian team paused the more invasive cutting and sawing procedures to gather additional structural data. While the station remains stable and the crew is safe, finding a permanent fix remains critical as the station aims to operate through 2030.
Would you like to know more about the spacecraft emergency procedures or how the international teams monitor micro-vibrations and structural fatigue on the aging International Space Station?
