The orbiting laboratory now faces a new air leak problem which has led NASA to postpone its upcoming commercial crew mission Axiom Mission 4 launch. Multiple insiders who are familiar with this situation declare that this issue is far from being a simple minor problem. The space agency faces serious issues due to the air leak because the hardware onboard is now outdated. Nearly thirty years have passed since this piece of equipment began floating above Earth.

You recognize this story because it is indeed familiar.

The ISS has been dealing with continuous air leaks that began in 2019. Experts have identified the Russian Zvezda service module as the main suspect because it is the oldest component of the space station having been launched in 2000. The transfer tunnel designated by the Russian acronym PrK represents the core problem area. The transfer tunnel connects Zvezda to the docking port which Russian Soyuz crew vehicles and Progress cargo ships use.

Cosmonauts have conducted numerous repair attempts on PrK’s small cracks throughout the years. The most effective measure they’ve achieved to address the air leak problem so far involves reducing the rate of air loss. The station lost about two pounds of air daily at its highest leak rate which did not pose immediate danger to the crew but remained far from optimal. Keeping the PrK hatch closed whenever possible remains the most dependable solution.

Things appeared to improve significantly in the course of the previous month.

Russia’s space agency Roscosmos declared the PrK module to be fully sealed. NASA echoed this update. The latest repair effort successfully stopped the air leak according to reports from both agencies. As engineers prepared to relax they faced an unexpected new problem. The station’s overall air pressure kept dropping.

This puzzled everyone.

The PrK module was reported sealed yet the station continued to lose air which presented a new problem for engineers. The current working theory suggests that the source of the leak is likely in the hatch seals connecting the module to the rest of the station rather than inside the module itself. The module maintains pressure but air from other parts of the station leaks into it through faulty seals. The module shows no signs of instability yet the ISS continues to experience pressure loss.

NASA is monitoring this situation closely behind the scenes. The agency’s internal mood of worry as described by a senior industry source led to the postponement of Axiom Mission 4 which was set to launch this week. The agency issued a brief announcement indicating the delay provides extra time to assess the situation and decide if further troubleshooting steps are required.

A new tentative launch date? June 18. The tentative launch date may be altered based on developments in the leak story.

We’ve reached a point where the situation becomes increasingly serious.

Experts worry that persistent leaks could indicate a severe underlying problem known as high cycle fatigue. The repeated stress over time causes high cycle fatigue which specifically impacts metal structures and aluminum more than other materials. Think about repeatedly bending a metal paperclip until it breaks. The paperclip remains intact initially but will eventually break from the stress. That’s high cycle fatigue.

It’s not just theory. It’s happened before.

Aloha Airlines Flight 243 encountered a mid-air structural break in 1988 because of metal fatigue. The aircraft’s fuselage ripped away unexpectedly without any prior sign. The successful landing of the aircraft by pilots demonstrates how fatigue can result in unexpected catastrophic damage.

NASA is not taking this lightly.

The agency previously rated structural cracking on the ISS at the top level of concern in its 5×5 risk matrix. NASA treats both the potential occurrence and potential impact of this failure with great seriousness.

The agency has kept its silence in spite of the existing concerns. No press conferences have been scheduled. No detailed updates offered. NASA’s only public statement so far has been brief and cautiously optimistic: The International Space Station crew performs their standard tasks safely.

That much, at least, is true. The astronauts aboard the ISS are safe. Daily tasks continue.

As the International Space Station’s infrastructure ages and mysterious air loss persists without an identified source, it becomes increasingly difficult to overlook the growing problem. The ISS represents more than twenty years of combined international efforts and scientific progress.

The International Space Station represents what happens as decades-old hardware starts to fail in the most extreme environment possible.