. >> you guys have a go for gca to remove the pump module. >> the astronauts worked quickly to remove the pump on the side placing it on a storage platform and leaving behind the empty slot for its repcement in all wrapping up the walk a full hour early. >> a good stopping point and you will be well rested to come out monday and finish with the spare and get it connected. >> reporter: space walks have become so routine the public rarely notices anymore when astronauts step outside the station. but last july, nasa came very close to losing an astronaut. for many it drove home the message that stakes on space walks are very high. lester. >> tom costello, the next space walk will happen on christmas eve. we're joined by steven robinson now, former astronaut and veteran of three space walks who retired last year from nasa after 36 years. thanks so much for being here. help me understand the urgency of this mission. if you lose all of your cooling on the space station, what happens? >> it's not good at all to lose the cooling an a space station because everything on the space station runs

. >> can i get gca? 20 centimeters zenith? ok, hopper am a five centimeters. >> 20 centimeters. >> copy, 20 centimeters. in motion. >> i see good motion. >> copy. that's about 20. >> and that motion. >> this is mission control, houston, five hours, 50 minutes into today's spacewalk. the two crewmembers are now pressing ahead to mate a handful of electoral connections -- of electrical connection to the newly installed pump modules. the valves are open and some 35 pounds of ammonia have flowed into the new pump. that will set the stage for of the pumpheckouts module systems throughout the day by the thermal systems officer here in mission control but we will not actually get to the pressurization of the pump andugh a nitrogen system actual activation of the pump until this evening. that activity should be complete by about mid-evening central time. further updates following the completion of today's spacewalk will be provided through the web , updates on our main page,www.n asa.gov that will appear on the station website. basica

hopper, you have a go to put the gca into position. >> the bend tool being discussed will be used by rick mastracchio to hook up to the m3 fluid connection line on the spare pump. want the valve is open to that particular line, it will enable stored nitrogen that has maintained a pressurized state to ultimately be replaced by the flow of pneumonia. comes the motion. >> copy. good motion. >> good motion. continuing. go for number one. i have the vent work tool. >> okay. copy that. it looks and you are in a good config there. -- it looks like you are in a good config there. >> ok. 5 cm. >> good motion. >> good motion. i am going to need to go starboard. >> complete. brakes are on. >> when you are ready and in position -- >> [indiscernible] up to mike.and it >> i am ready. >> copy. you are going to remove the plug. it should have a lanyard on it. that is just pulling that on the release frame, squeezing the trigger. that -- gooddo job. you got it. there is a plug. it is removed. >> copy that. the m3oing to meet it to male connector. i will read you the steps. when you're in position and