Transcript for Thai cave rescue: The moment divers learned their mission was a 'go'

The ominous weather matches the mood of the rescue team. As he anxiously awaits approval. Portage daring plan to get the team now before the full fury of the monsoon rains it. Had to wait one more day. What do you think what you think this. One mortgage. Thinking that review could be difficult for us because that news come. Agonizing hours hands and every point and make their final work comes down from the Thai prime minister himself. Rescue me issue he's ago. It's about 6 PM at night what's thankfully that was when we finished up with all of our phase one operations we were ready to go at that point what was your reaction when he finally understood that. This is happening relief that we could get only the bills nervousness that we would actually have to do it I'm wrong. People when you know demand and the day to day is being paid 300% Britain's securities told us that these are worth it for his voice to be rescued from that Kate to seeing more and more personnel arriving now the wait its waited sudden. Furious action immediately stripped away. And hopefully it's put up to block the key veterans this crude diapers what's the when it. A massive number of extra air tanks are put in place and it's important divers are deployed in the drying areas throughout the case but the tip that this thing here. Is that the week. We'll zoom over British dimes. Each of test with bringing out one boy at a time. It was 1 diver 1 morning that's good that's tremendous amount of responsibility bedrooms. But with a rich reach that far away cavern where the team is trapped. It always themselves are shockingly cult series that terrifying ordeal there facing. The children were extremely brave very confident. That was Alyssa Lorraine. Distress and that means that the problem. Extremely confident. Very brief illness.

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