Transcript for Hospital prepared to receive boys in advance of their rescue from Thai cave

What do sending severed she Adrian banker he's right outside of the local hospital where two boys have arrived. These boys just ages eleven to sixteen any drinking you walk was frail. What exactly they're gonna walk into an hospital kind of treatment that they will receive once they arrive. Yes Paula thank you right behind us here we know that the eighth floor is reserved for those boys. Now the good news as you're from that is that before boys that we know are here are healthy. But they will run through a complete medical evaluation among here at the hospital as well as be reunited with their families on that he will work. We also note that while they were still excited haven that staging area. They had a series of tests on and on them and they had a paramedic as well as of nurses and doctors assigned to them. To try to treat them while they were still at the cave site but once here they're going to undergo a complete evaluation. And we know that. Four ambulances have come through this police barrier. With the lights flashing with the police and medical escort. We don't know exact details as to who was inside this four ambulances but we do know that police opened the barricade behind us here. You can actually see the entrance to the hospital that green fabric she route into the front entrance. And we got it freezers so keeping the press members of the press back with all due respect to their families this has to be. That most amazing. Day of their lives and the world wants to know I can't tell you how many messages I've received on social media about our coverage saying thank you to ABC. For giving this story of the attention it deserves and giving hope to a lot of people around the world have been hoping and keeping their fingers across the I was praying for the safe return of those boys you mentioned. The first two and we know pursue work. One of those first out of a cave is a thirteen year old boy. Again the weakest of the twelfth boys inside that he brought to this hospital but we are ecstatic. That four of them are now out safely for sure calling Dan. Any hear what kind of ailments are they expecting to treat there at the hospital. Well again this first for a healthy but if they do indeed need further medical treatment. There is a concern for their breathing we talked a lot about seat lower oxygen levels inside that cave which can contribute. To weakness bodily weakness as well as emotional and mental weakness they're inside those dark conditions overall for two weeks rate. One lighter note they could be wearing sunglasses and they come out if they are rescued tomorrow. Not because they're ice they'll have to adjust to meet the difference in the sun being out in round numbers when things meetings and McCain as well within factions they're watching for those kinds about bacterial infection that you can get from being. So close to or in the water for such a prolonged period of time. Others also a lung infection that is airborne called cave disease that doctors will be checking and treating four. And as well posttraumatic stress disorder this was. Something that any none of us could really imagine going through. I mean thinking about children ages eleven to sixteen inside of a cave. Not knowing whether somebody was gonna come and rescue them and yet hopeful. When you think about some of the things we heard from them coming out of that tape the fact that their coach was there keeping them all together maintaining the camaraderie that they had. As a soccer team and as a family as they waited for those divers to reach him you have to imagine Adrian thank yet imagine if they use. This on their societies Boyes had. Written letters to their parents asking for barbecue pork for fried chicken mom and dad don't forget about my birthday please plan my birthday party I'll help you distort exactly exactly anti officials say despite everything these boys were strong physically and they respond mentally and that's what we can't stress enough that ears judge one of the letters on the screen at such and cared all that don't forget to set up my party Hampshire he's going to have a birthday party of a lifetime James Longman. And let's it's let some things to James James you have been on this story from the very beginning. And we want to shoot she into just kind of refresh every went how does the boys get to this point how to think it so far. Into that cave there are nearly two point nine almost three miles ended at came how to think it themselves and at that position to begin. Well below this was a place well many people in time out of this part of Thailand comet was. We understand place that this particular soccer team in that courage like to come today. I out to see how far they could get. And cruel for the hostages write their names and then come back but as you say two point nine miles and then the flash floods came in they went in that would it was dry. And if you think about the mound when he is dry and compact flight out of the housing that a little rain in the suddenly. It keeps down it runs off straight into those tunnels and two hours it flooded they found themselves right back in that case. Unable to get out that days and days. No one you. Wedding why they didn't have any ideas they were live the press that he mounted on the the interest of the cave just and about. 7800 meters behind it. For days until finally. On the amazing day we will remember when those two British divers hooked up in the cabin where they were it's sort of huddled on that money bank. We saw those amazing images of those boys in that socket tea sets. Sitting cross legged on not bank looking up and amazed smiling but then the real life began to get him out. That was the jubilation but then real consent because the water level was so high spent days and days trying to get it down. And then back to speed up the price that's because of the rain really started to consign officials paid about that former navy seal who. Very sadly died. On the way back from Lang oxygen tank say it all looked extraordinarily. Bleak for quite a long time. I the last few days and I spoke to say. This mission tonight and has really taken a lot of people by surprise and a lot quicker than I think we anticipated but like we say tonight. More boys the next coach us asleep at sleeping and not cave in tomorrow's going to be another big day. At best case scenario that Thai officials sent four out and they will start extracting the remaining boys and ten. By roughly the next ten to twenty this. That's exactly right and just to recap whereas pay a great moment in this unfolding story. The Thai officials confirming that four boys out safely there in good health more boys to come. We intend to twenty hours wanna thank gains Longman and the rest of the team. Over in Thailand we want to tell you that we hear ABC news will continue to cover this story throughout the day right here ABC news and on abcnews.com.

This transcript has been automatically generated and may not be 100% accurate.