On Thursday, the Moscow Mission Control Center instructed Russian cosmonaut Ivan Vagner to use as much tape as possible in Zvezda's intermediate chamber, where the source of the leak is expected to be located.
On Friday morning, Vagner informed specialists at the Center that the pressure in the compartment had declined by 17 mm Hg down to 715 mm Hg.
A small air leak was detected in September 2019 on the ISS, and by August 2020, the leakage rate had increased five-fold — from 270 grams to 1.4 kilograms (9.5 ounces to 3 pounds) of air per day. The leak does not pose a risk to the crew.
According to Sergey Krikalev, the executive director of Roscosmos for piloted programs, additional air volumes will have to be delivered to the station if the crew fails to seal the leak.
Russians Anatoly Ivanishin and Vagner, as well as American Christopher Cassidy, are currently working on the ISS.