"It's going to be challenging both physically and technically", he said. The leak created a slight loss of pressure, and space officials said the station has remained safe to operate. "All along, mission control in Moscow pleaded with them to take it slow so they wouldn't make the situation worse".
The cause of the hole on the Soyuz MS-09 spacecraft, docked to the station, has not yet been established.
It was late August when a mysterious hole was discovered in a Soyuz spacecraft attached to the International Space Station. The astronauts collected samples of the black epoxy sealant protruding from the hole, just one-tenth of an inch (2 millimeters) across.
"The active participation of worldwide partners, primarily NASA, in the investigation is not expected, although we have called for a joint investigation and been ready to provide available materials: photos, videos, documents, samples of materials taken during the spacewalk", the source said.
Unlike the ISS, the spacecraft is not created to be repaired in space and has no railings or anything to cling on to from the outside.
NASA said the pieces of freed insulation posed no threat to the space station and would likely burn up in the atmosphere in a day or so.
Russian media reported the investigation was probing the possibility USA astronauts deliberately drilled the hole to get a sick colleague sent back home. With Gerst Prokopyev, and the USA astronaut Serena Auñón land-Chancellor shortly before Christmas, back on earth.
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The pilots from the two countries practiced air cooperation when fulfilling air tasks, reports TASS . Rob Manning said he had no specific information about the deployment.
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Pujara was absolutely magnificent, we've asked him to be a little more upright to counter bounce in these conditions". "And your batsmen have to take more responsibility, which is challenging but at the same time it is exciting." .
Oleg Kononenko and Sergey Prokopyev's spacewalk, originally expected to last for six hours, began at 1600 GMT on Tuesday.
Russian officials later denied those reports.
The cosmonauts also took photographs and filmed video, before putting new insulation over the area.
Dmitry Rogozin, the head of Russia's civilian space agency Roscosmos, described the spacewalk as "unprecedented in its complexity".
The two cosmonauts then used the same tools to cut into and peel away a thin metal orbital debris shield to expose the hole in the Soyuz MS-09's orbital compartment. The hole is in a section that will not be used for the return journey to Earth on December 20.
The pair then returned back inside the space station after determining that they wouldn't need to cover their handywork with a thermal blanket.