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Configuration you have to put force into it. the problem with applying force, you don't want to break equipment. there are delicate valve closure and opening mechanisms you don't want to disturb. the other problem the body with the weightlessness doesn't have way to move this around unless you're anchored. doug is out there on a foot platform to exert the extra force to get it off. they will get the pump disconnected but probably not as far along as they hope to get. >> shannon: someone who has done an amazing thing, been on a spacewalk to do repairs before, what is going through your mind? ar...

Half of the station's pump is gone. if the second goes down you would have to shut it down and in survival mode with emergency repair campaign mounted after that. to replace today's pump package. they are dealing with stiff cooling lines and remove the electrical and mechanical bolts to remove and get the spare in place. >> they are calling this the managers of the mission a major failure. have you heard of this happening before in and what are the predictions and guarantees that they can make the repair? >> this particular failure has not happened before and considered one of the 10 or 15 to ...