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It's by no means a record, but certainly a challenge and a physical toll taken by the astronauts when they're out there. they also had to confront neighbors of highly toxic ammonia which was leaking from the repair site. so the astronauts managed to remove the bad pump module from the exterior. you can see it on the screen there. they had to disconnect all the fluid lines, take out electrical power talks remove the mounting bolts, and then they unhinged that pump out of the cooling system. it wasn't exactly a scene from "gravity" or "apollo 13", but the danger was chilling the ammonia too much...

The pump station's structural truss. they had to disconnect all the fluid lines. they got that pump out of its receptacle and out of the cooling system and parked it in a temporary parking spot. they'll go back monday and retrieve the spare cooling pump that will be removed, put on the robot arm and put into place and reconnected. if they get through all of that on monday, they won't have to go outside on christmas day. that's sort of a christmas gift if they have to do a third one. >> let's talk about the critical nature of this. if they do not repair this, what kind of hazards will this caus...

Upside-down right now, but i guess it doesn't matter in space. >> normally upside-down. they've come out of the air lock. been out maybe 30, 40 minutes at this point, and they've checked out their suits. everything is working fine. they've set up their work site, and now are getting to work throughout their procedure. still going through some of the setup phases and then will start preparing the old pump module to come out and the new one to be ready to go in. so they're not going to do that exchange today but they're getting a lot of prep work done in today's space walk. >> they'll be there 6...

Two astronauts completing a spacewalk high above the earth during which they removed a broken cooling pump on the international space station. the damaged system has hampered operations aboard the orbitalant could be finished next week. here is tom jones, author of "sky walking, an astronaut's memoir." tom, it's good to see you. >> thanks, merry christmas to you. >> let's talk about this. this is a very critical mission for the astronauts on board of international space station. today's walk, spacewalk, took five hours and 28 minutes, so they completed it a little bit ahead of time for what th...

Those astronauts will be making a spacewalk to replace a failed pump module outside the space station on saturday and maybe even on christmas day. we'll be right back. stick with power. stick with technology. get the new flexcare platinum from philips sonicare and save now. philips sonicare. this is the creamy chicken corn chowder. i mean, look at it. so indulgent. did i tell you i am on the... [ both ] chicken pot pie diet! me too! [ male announcer ] so indulgent, you'll never believe they're light. 100-calorie progresso light soups. you'll never believe they're light. but with less energy, m...