Video: Astronauts return safely from space walk

Video caption, 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.