NASA's Nick Hague and Roscosmos' Alexei Ovchinin blasted off to the orbiting lab on Thursday but had to make an emergency landing in their capsule less than two minutes into the flight after their Soyuz rocket suffered an unspecified failure of its second stage.
"The guys will definitely fly again," he tweeted.
Vyacheslav Rogozhnikov, chief of the Russian Federal Medical and Biological Agency, said on Russian state television that the two men are "in great health" and do not require medical treatment.
While the Russian program has been dogged by a string of problems with other kinds of launches in recent years, Thursday's incident was its first manned launch failure since September 1983, when a Soyuz exploded on the launch pad.
"The details of the reason why whether that was a cable or a nut we need to look at it and analyze. We need more data," he said.
Roscosmos said on Thursday that it would suspended all manned flights to the space station pending the investigation, and Krikalyov said on Friday that the orbiting outpost could be switched into an unmanned mode if the investigation takes a while. But Russia would like to avoid mothballing the station, he said.
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