An International Space Station Leak Is Getting Worse, NASA Confirms

Ars Technica reports NASA officials operating the International Space Station 'are seriously concerned about a small Russian part of the station' — because it's leaking.
The 'PrK' tunnel connecting a larger module to a docking port 'has been leaking since September 2019... In February of this year NASA identified an increase in the leak rate from less than 1 pound of atmosphere a day to 2.4 pounds a day, and in April this rate increased to 3.7 pounds a day.'
A new report, published Thursday by NASA's inspector general, provides details not previously released by the space agency that underline the severity of the problem...

Despite years of investigation, neither Russian nor US officials have identified the underlying cause of the leak. 'Although the root cause of the leak remains unknown, both agencies have narrowed their focus to internal and external welds,' the report, signed by Deputy Inspector General George A. Scott, states. The plan to mitigate the risk is to keep the hatch on the Zvezda module leading to the PrK tunnel closed. Eventually, if the leak worsens further, this hatch might need to be closed permanently, reducing the number of Russian docking ports on the space station from four to three.

Publicly, NASA has sought to minimize concerns about the cracking issue because it remains, to date, confined to the PrK tunnel and has not spread to other parts of the station. Nevertheless, Ars reported in June that the cracking issue has reached the highest level of concern on the space agency's 5x5 'risk matrix' to classify the likelihood and consequence of risks to spaceflight activities. The Russian leaks are now classified as a '5' both in terms of high likelihood and high consequence.

'According to NASA, Roscosmos is confident they will be able to monitor and close the hatch to the Service Module prior to the leak rate reaching an untenable level. However, NASA and Roscosmos have not reached an agreement on the point at which the leak rate is untenable.'
The article adds that the Space Station should reach its end of life by either 2028 or 2030, and NASA 'intends to transition its activities in low-Earth orbit onto private space stations,' and has funded Axiom Space, Blue Origin, and Voyager Space for initial development.
'There is general uncertainty as to whether any of the private space station operators will be ready in 2030.'

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