janice mackie frayer has more from thailand. >> reporter: the boy and soccer coach appear in good spirits. new video shows them smiling and laughing withhai navy divers. the doctor treats their cuts and then one by one they send messages to their families. >>> i'm in good health, he says. another flashes a victory sign. but the boys are also at risk. heavy rains could push water levels higher inside the cave. that threat is forcing thai officials to consider an evacuation soon. >>> the province, the governor said, if there is a risk we will not move them out. >>> rescueke worrs are doing drills preparing for the moment the boys are brought to the surface, while officials say they are getting a crash course in diving and wearingll ace masks. none of them can even swim. we spoke to a diver advising the rescue team who has been inside the cave about the mission. >>> you're not confident they can do it? >> i think they can. i thinkt's possible. it's very grim choice to make and it's very easy to --. >> reporter: he says a safer option may be drilling a hole a half mile down right to the cave

here's janice mackie frayer in thailand. >> reporter: tonight, the teens the world has been cheeringor. smiling in their uniforms and back playing soccer, revealing for the first time how they survived those ten days they were lost inside the cave. "i tried not to think about food so i didn't get 11 is the youngest in the group. they talked about what they called a miracle. >> how many of you? 13? brilliant. >> reporter: it was captured the world's attention. >> you speak english? >> a little. >> "i heard people talking and wasn't sure it was a hallucination." their faces now showing little trace of their terrifying ordeal, describing how they licked water off walls to stay alive and conserved batteries in their one flashlight. at the press conference, they hugged family and friends, and mourned the former navy s.e.a.l. thai diver that died "i want to be a professional soccer player,dom says, but i also want to be a navy s.e.a.l." >> you must be very excited to get him home. his grandmother who raises him, tells us they're just thankful he's getting a second chance at life. a hero's