Having completed this section, the boys are then handed over to separate, specialist rescue teams, who help assist them through the remainder of the cave, much of which they can wade through. Four more boys and their coach still remain inside the cave.
The four boys pulled from the cave Sunday in an urgent and risky operation that involved them diving through the cave's dark, tight and twisting passages were happy and in good health, authorities said. In a press conference last night he said it was up to the divers to decide whether it is possible to save all five at once, warning the plan worked best with four. "We worked faster. I'm so happy", Narongsak said.
Chiang Rai acting Gov. Narongsak Osatanakorn said they "hope to hear good news in the next few hours".
On Sunday night, Thai navy SEALs posted a celebratory note on their Facebook page, saying: "Have sweet dreams everyone".
Rescue workers prepare to transport boys rescued from that Luang cave complex Sunday in Chiang Rai province in an image provided by the authorities.
Australia's foreign minister says 19 Australian personnel are involved in the Thailand cave rescue operation including a doctor who's played an essential part in assessing which boys can leave and in what order.
About six hours after they entered the jungle cave to resume the rescue operation, divers emerged with one of the boys in tow.
The extraction of the four on Monday followed a similar pattern to the previous day, with the youngsters emerging in quick succession just before nightfall after navigating a treacherous escape route of more than four kilometres.
Monsoon flooding cut off their escape route and prevented rescuers from finding them for nearly 10 days.
The rescuers are racing against time, as more rain is forecast, and the extra water would significantly complicate matters.
The soccer team had been trapped in the underground cave network since June 23, with flash floods causing water levels to rise, making it hard to get out.
Thai public television has aired live video of a medivac helicopter landing close to a hospital in the city of Chiang Rai, near the site of the cave where a youth soccer team has been trapped for more than two weeks.
There was no immediate word on their conditions.
All eight boys were rescued by divers using guide ropes and shared oxygen tanks.
Rescued schoolboys are moved from a military helicopter to an awaiting ambulance at a military airport in Chiang Rai, Thailand, July 9, 2018.
Thai authorities revealed that the first phase was executed "smoothly" and the boys who had been evacuated were in "good health". On Monday, a second rescue operation by the same team of divers took only nine hours to bring out the next four.
A hospital spokesperson told media the priority was to make sure the children were safe. Jesada said they were uncertain what type of infections the boys could face "because we have never experienced this kind of issue from a deep cave".
And Gianna Infantino, the president of Federation Internationale de Football Association, soccer's governing body, has invited the boys to the World Cup final in Moscow on Sunday.