During a spacewalk, Russian cosmonauts may examine from the outside the hole in the Soyuz MS-09 spacecraft, which caused a pressure drop aboard the International Space Station (ISS) last week, a rocket and space industry source told TASS on Friday.

"The possibility of conducting a spacewalk to examine from the outside the hole in Soyuz is now being considered. Possibly, they will be able to find the ‘plug’ that closed the hole before the August 30 emergency situation, or some other ‘evidence,’" the source said.

TASS has been unable to officially confirm the information at the time of the publication.

"A spacewalk is unlikely to be carried out for the purpose, but such works are possible during routine maintenance," the source added.

At the same time, the source said that the commission investigating the incident is looking into all possible versions.