CNN The Lead With Jake Tapper December 24, 2013 21:09:00
>> reporter: three hours into the sfas wapace walk, the unit place. >> it's got to go in another inch or so. >> there you go. >> she's finished. pump module in position. >> reporter: the task is a delicate one. the equipment contains a noxious cooling fluid, ammonia. >> some of the dangers hooking up the big heavy ammonia lines, they're really thick and massive, and hooking those up of course, if you were to leak ammonia, it's not a very pleasant chemical. you couldn't bring it inside. so there's definitely risk there. >> reporter: the risk became reality when one of the fluid lines carrying t...
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