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Video: Astronauts return safely from space walk

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See the astronauts' space walk.

Astronauts from the International Space Station have returned safely from an emergency space walk.

They went to try and fix what's been described as a serious leak from the station.

Although they didn't find a leak they did replace a pump on the station.

This kind of thing is really rare but officials say the crew are all trained to deal with situations like this.