It's been over a month since we first learned of the apparently man-made hole that caused a small air leak on the International Space Station. NASA astronauts Drew Füstel and Ricky Arnold and Oleg Artimyev of Roskosmos landed in the southeast of Kazak town of Kazakhstan at 11.45 pm on global time.
The US space agency said that ruling out defects "does not necessarily mean the hole was created intentionally or with mal-intent".
A NASA astronaut and a Russian cosmonaut are due to launch next week to join three astronauts who remain in the orbit.
"NASA and Roscosmos are both investigating the incident to determine the cause", NASA said on Wednesday. Last month, the Russian newspaper "Kommersant" had reported that in an investigation, this possibility was detected that American space travelers had holes deliberately so that a sick colleague could be sent home.
"We will hold talks will Bridenstine at Baikonur on October 10".
Members of the worldwide crew of a manned transportation spacecraft Roscosmos cosmonaut Oleg Artemyev, NASA astronauts Andrew Feustel and Richard Arnold have become the members of the 56 expedition.
The six-person ISS crew includes two Russians, two Americans and a German representing the European Space Agency. Thursday's planned return to Earth of the crew of a NASA spaceship "the Union" along with Ricky Arnold and Oleg Artemyev of the space Agency "Roscosmos".
Since the retirement of NASA's space shuttle in 2011, Russia's Soyuz has offered the only ride for people to and from the station.