Narongsak also said Monday that the condition of the five remaining people in the cave is "still good". Osatanakorn said hospital officials are working on a plan to allow parents to see the boys "at a distance through glass".
"If we wait and the rain comes in the next few days we will be exhausted again from pumping and our readiness would drop".
Authorities had said that incoming monsoon rains that could send water levels in the cave rising, coupled with falling oxygen levels in the enclosed space, added to the urgency of getting those trapped out.
Authorities have not confirmed the identity of the first four boys rescued. "This is a catabolic state for these kids and this coach, meaning they are breaking down muscle because their physiologic state of stress is so high", she said.
Anupong said divers need to place more air canisters along the underwater route to where the boys and their coach have been trapped since June 23. Secondly, after a delay of several hours required them to replace the oxygen tanks along the path, the teams of divers are going back in, to bring more of them to the surface. The boys and their coach have been stranded about four kilometers inside the cave.
Nuttachoong Pimtong, a 14-year-old friend of Adul Sam-on, one of the 12 trapped boys, said he was watching a Thai television network with his family when he saw the first footage of the second group of boys leaving the cave site in ambulances. After Monday's rescues, Prime Minister Prayuth Chan-ocha visited the eight freed boys in the hospital where they had been taken by helicopter.
Chiang Rai governor Narongsak Osotthanakorn said at a press conference on Monday that the effort would involve the same divers. Sunday's mission took nine hours and plenty of energy, with each child being accompanied by two divers along the way.
Thai officials say four boys were brought out of a flooded cave in northern Thailand on Monday.
The rescue mission is still underway.
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Divers are preparing for the next phase of Thai cave rescue after safely evacuating 4 of the 12 boys; Bryan Llenas has more. Those conditions won't last if the rain resumes, he said.
"The water level is not worrisome ... yesterday's rain did not affect water levels inside the cave".
There had been efforts to pump the water out but those were set back every time it rained.
Thai officials have been tight-lipped about the rescue operation, and would not comment on how many people were removed Monday.
But with oxygen levels inside dropping to risky lows and the prospect of heavy rains flooding the area completely, authorities decided they had to move quickly, and take the group out through the water-filled tunnels.
The ordeal has riveted Thailand and captured the world's attention.
The Tesla TSLA chief executive on Sunday shared a video via Twitter, demonstrating a "tiny, kid-size submarine" being used to transport a person across a pool. If the tests were successful, the sub was to be placed on a 17-hour flight to Thailand.
"The four children are fine". However, it is unclear if the device is part of any current rescue plans.
"Very courageous and talented people!" he tweeted.