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What they need over the next four or five days while they wait. we have the coordinator of the rescue commission via skype. your message of what you've seen and heard so far relative to this rescue operation, i think the word miraculous has got to come to mind. >> absolutely. we initially weren't sure we were going to find them in the cave, then finding them and finding them alive was just the absolute joy. but then the real hard work starts because now you have to figure out how to get them out, and there were the three primary options that had been talked about over the last few days. and th...

Big prop, ryan. >> gene helps us to understand the urgency that they have if they want to begin this rescue. i do want some perspective from a professional cave diver. the coordinator for the national cave rescue commission, mr. mer merza, this mission could be started pretty soon. what is your confidence level right now that these rescuers in thailand can bring the boys out alive. >> one correction. i'm an open-water diver. i'm a cave rescue expert. my professional opinion here is that they are the best placed and the best possible choice, if the diving option is what they end up going with...

Can send ground teams. it might seem counter intuitive but even if a cave is relatively well met underground it doesn't mean you know at what point above ground you need to drill down and find the specific chamber. at this stage it does look like the diving option or best case scenario pump enough water out of those chambers to crawl out to a large degree that's the best case scenario. when the rains come though the clock will be ticking and that's why you have all of these rescue workers from around the world here trying to martial their resources and human ingenuity to get the 12 boys out. g...

Give us the developments a t this hour, anna. >> they are still looking at the diving option to extract those 12 boys and the coach from the cave that has had them for the last 11 days. we saw incredible video today of these boys. yes, they were smiling but their faces so gaunt, they have lost so much weight so their health is pair mount because they need them to be strong enough if they are going to get out of this cave by diving. you mentioned the full-face masks. well, they would wear them and basically all the kids would have to do is breathe. the oxygen tanks would be attached to the navy...

>> reporter: yeah. but options, indeed. you mentioned the diving option. well, the boys inside the cave have been trying on these full-face oxygen masks. they look like a gas mask, but it's connected to an oxygen tank. the navy s.e.a.l. divers would wear the masks while the boys are guided out of the cave. you mentioned the passageways. you know how small they are and they're completely filled with water. these boys cannot swim and certainly have not dived before. this is not what they want to do, but the boys have been trying on these masks, christine, and they are getting more comfortable. w...