The Thai boys' team called the Wild Boars became trapped when they went exploring the complex Tham Luang cave in northern Thailand, on the border of Myanmar, after football practice on June 23.
Eight other boys, aged between 11 and 16, and their 25-year-old coach remained stranded as of Monday morning.
Mr Narongsak said that experts told him new rain could shrink the unflooded space where the boys are sheltering to just 10 square meters.
"Today was the best situation - in terms of kids' health, water and our rescue readiness", he said.
Four boys were rescued on Monday evening following the four who were bought safely out of the cave on Sunday. "But there are caves where. explorers could go in and be trapped by rising water during like a heavy rain and trapped in an air pocket", Brick said. "From what I've seen in the clip, they did look skinny", he said.
School students in Ahmedabad play for the well-being of 12 soccer players and their coach who were trapped in a cave in northern Thailand.
It was Harris who gave the medical all-clear for rescue efforts to begin.
Expert divers on Sunday managed to get four of the 12 boys to safety.
"The weather conditions and other environments today are as good as yesterday".
Foreign Minister Julie Bishop told reporters in Australia that anesthetist and experienced cave diver Richard Harris is working with the Thai medical team inside the cave "to make the decisions about the order in which the boys were to be extracted".
The second extraction attempt involves a larger team of Thai and foreign divers, some of whom took the places of divers who were exhausted after Sunday's extraction, he said.
Four boys and their 25-year-old soccer coach still remain trapped underground as an worldwide effort of volunteer divers and elite Thai Navy Seals shuttle back and forth to bring them to safety.
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But the governor supervising the mission said earlier that mild weather and falling water levels over the last few days had created optimal conditions for an underwater evacuation that won't last if it rains again.
Narongsak said the operation had proceeded hours faster than expected, adding that it was "a great success".
Narongsak said favorable factors for a successful rescue, including the fact that water levels in the cave remain stable even though rain had fallen. There was some rain on Sunday, which caused some water to go into the cave, but officials were able to pump an nearly equal amount of water out.
Somboon Sompiangjai, 38, the father of one of the trapped boys, said parents were told by rescuers ahead of Sunday's operation the "strongest children" would be brought out first.
An update Saturday from the Thai navy said three navy SEALs were with the boys and their coach, one a doctor.
Monsoon flooding prevented the group from escaping and from allowing rescuers to find them right away.
The ordeal has riveted Thailand and captured the world's attention.
Musk shared via Twitter videos of his engineers testing its "kid-size submarine" - the same one that is apparently on its way to Thailand - underwater in a Los Angeles pool.
The rescued boys will be in quarantine for at least 24 hours, Tracy reports.
The current rescue operation is not, Tracy said, "the preferred option".