Sergei Prokopyev said the investigators looked at samples he and his team-mate Oleg Kononenko had gathered during a spacewalk on December 12th. Prokopyev and two other astronauts returned to Earth last week from a 197-day Space Station mission.
The hole in the Russian Soyuz spacecraft, which was attached to the station, was discovered on August 30. The crew discovered a leak that led to a slight hole pressure loss and clogged the hole with epoxy and gauze.
Prokopyev said at a press conference that the cavity emanates from the interior of the capsule and "it is up to the investigators when the hole was made."
The Astronauts "The rapid identification and repair of the hole showed that" the crew was prepared for any developments, "he said.
The hole posed no threat to Prokopyev and NASA's and Alexander's teammates Serena Aunon-Chancellor Gerst from the European Space Agency during her return because the portion of the capsule he was on was dropped off before the fiery re-entry into the Earth's atmosphere.
Roscosmos boss Dmitry Rogozin said the hole could have been drilled in September when the Ca psule was made or in orbit, Rogozin did not manage to accuse the crew members, but the statement has led to friction between Roscosmos and NASA.
Ever since Rogozin reversed the statement, he threw the news media the blame that he had twisted his words.
The hole could have been drilled and said by an astronaut have: "You should not think so bad about our crew."