The hole appears to have been caused by either space junk or a small meteorite colliding with the station.
Flight controllers and crew then effected a fix in which Soyuz commander Sergey Prokopyev used epoxy on a gauze wipe to plug the hole. Yesterday, crewmembers traced the leak to a 2-millimeter-wide hole in one of the two Russian Soyuz spacecraft that's now docked to the orbiting lab. It turned out that PROTEK docked with the space station Russian spacecraft Soyuz MS-09, reports the press service of NASA.
A tiny leak detected on the Space Station is now venting air into space, but NASA assures that the crew is safe and repairs are underway.
Nasa has stressed that at no point were the astronauts in any danger. "The design engineers believe it is the result of a micrometeorite".
Soyuz spacecraft have been crewmembers' only ride to and from the ISS since NASA grounded its space shuttle fleet in 2011.
NASA officials said the hole was discovered in part of the Soyuz that does not return to Earth.
"Flight controllers determined there was no immediate danger to the crew overnight".
They eventually discovered that the leak was coming from a 2 millimeter hole in the Russian segment of the ISS, the upper section of the Soyuz MS-09 spacecraft - which is now attached to the Rassvet module.
For the six astronauts on the 250-mile-high ISS, now home to three Americans, two Russians and one German, things like orbital debris is always constant threat, even the tiny 2mm pieces.
The small hole in a capsule is now being covered with a special type of tape that can deal with extreme temperatures. "If an air leak goes from the inside into outer space, then it is better to install a plate precisely from the inside". SpaceX plans to fly Demo-2, its first test flight with a crew, in April 2019, while Boeing's Crew Test Flight is now slated for mid-2019, according to a new schedule that NASA released August 2.