Russia launched checks Tuesday after its space chief said an air leak on the International Space Station last week could have been deliberate sabotage. Space agency chief Dmitry Rogozin said the hole detected Thursday in a Russian space craft docked at the orbiting station was caused by a drill and could have been done deliberately, either back on Earth or by astronauts in space.
Astronauts used tape to seal the leak after it caused a small loss of pressure that was not life-threatening.
"There were several attempts at drilling," Rogozin said late Monday in televised comments, adding that the drill appeared to have been held by a "wavering hand". "What is this: a production defect or some premeditated actions?" he asked.
"We are checking the Earth version. But there is another version that we do not rule out: deliberate interference in space."
A state commission will seek to identify the culprit by name, Rogozin said, calling this a "matter of honour" for Russia's Energiya space manufacturing company that made the Soyuz.
Asked for comment on allegations of possible sabotage, a NASA spokeswoman referred all questions to the Russian space agency which is overseeing the commission's analysis.
Rogozin had said the hole in the side of the ship used to ferry astronauts was most likely caused from outside by a tiny meteorite, but later admitted it had been ruled out.