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Just sent tom donilon to prepare for this china summit. he was in china last week doing the prep work with his counterparts in china for the summit that is taking place at the ends of the week, yet they are doing this switch today so donilon is not involved. it's susan rice. that part of it seems a little whiplashing. >> robert gibbs, what do you think is i didn't understand the announcement now behind the timing? >> tom has been there a long time and been in this administration the first term and first as national security adviser and head of the national security adviser. i agree with chuck,...

But they did. how? >> reporter: it's pretty remarkable. you remember, jake, we saw something similar in joplin, as well, where a hospital becomes something in the path of the storm. some of it is just fast thinking. some of it is preparation by people in order to try to make sure patients and staff are safe moving, for example, as you have heard to the center of the building if you can to an area away from windows. it was fast thinking i think and a lot of prep work. nobody in my understanding is talking to doctors, no one was injured inside the hospital. you look at that. the top floor is jus...

And tom marshburn are the guys be headed out to fix an ammonia making the repairs and we will leak in just a moment. we want to bring in cnn's john be keeping an eye on this with zarrella covering this from cnn's john zarrella. he's covering this from miami, miami. walk us through leading up to and i know john looks at this this moment, what's going to and he sees some things that i happen as they start this don't necessarily see. what are they doing, john? emergency space walk as they call it. >> reporter: sure, they're a little bit behind schedule, had >> they're preparing to remove a little...

It was traffic cone paint, so it really stood out. >> although the neon paint will make it easier to spot, they will need something much more dependable if they want to find it. >> an iphone seemed to have the best app to track the balloon. it gives you longitude and latitude but altitude as well. >> if you lost your phone, you would have where to track it. and we could follow it. >> next to the camera was a little hd camera that's used for sky diving stunts and motor sports and things like that. the whole craft with the camera and tracking system is within the four-pound limit for faa regulat...

Antarctica. and you're right. but don't call shenanigans yet. the expedition is going to take a bit of time to get to antarctica. then the explorers have to do some prep work to set up. then they will head out on foot followed by tractors across the vast iciness that is antarctica in what will be pretty much total darkness for months, enduring temperatures at 94 below zero. 94 below zero. this is the guy who is leading the expedition. he is kind of an amazing guy. the guinness book of world records calls him the world's greatest living explorer. he's a member of the british aristocracy. the th...