Mission Accomplished, the Cooling System on the International Space Station Is Repaired

Astronauts experienced some unexpected trouble when they discovered an ammonia leak.
3:00 | 12/24/13

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Transcript for Mission Accomplished, the Cooling System on the International Space Station Is Repaired
We turn to space tonight and that delicate space walk this christmas eve, astronauts suiting up after concerns over their space suits, the regular flags earlier this week. Millions of americans who watched the movie gravity found themselves watching a real space walk unfold today. Ryan owens with a fascinating view from space. Reporter: One man alone at the end of that farm. 260 miles below him planet earth whipping by at seven miles a second. Breathtaking doesn't begin to describe it. Mike hopkins taking a special sleigh ride on this christmas eve holding the 780-pound module. Reporter: Astronauts mike hopkins and rick mastracchio risking their lives to replace a cooling pump on the international space station. That's hopkins holding it. It looks like a huge refrigerator. This is hopkins' first trip to space. The miss native is a former college football captain who recently bragged about getting his first haircut in orbit. His partner mastracchio is a space walk veteran. This is the 8th walk for the father of three from connecticut. Nice work, guys. Reporter: It took two spacewalks, 12 hours in the black vacuum of space, but the duo did what they came to do. We have a pump that is alive and well. Reporter: And more importantly, they reported no problems with their spacesuits today. No water leaks this time. Everything is nice and dry. Best christmas present ever. It took us awhile to get it done but we did it. Reporter: We are inside a mockup of the airlock here at the johnson space center. This is what the astronauts actually train in and just a couple of hours ago those two returned safely to a room just like this to repressurize. I think it is fair to say mission accomplished.

This transcript has been automatically generated and may not be 100% accurate.

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