He was taken by helicopter and ambulance to the same hospital in Chiang Rai where the first four boysrescued Sunday by a team of global and Thai dive experts are being treated.
The operation on Monday went more smoothly than on Sunday and took two hours less as the practice became more refined, he said.
A total of eight of the 12 boys have now been brought out of the treacherous cave system by divers, including four who were brought out on Sunday, when the rescue operation began.
There are now five members of the Wild Boar football team now left in the cave.
Among those are United States military partners, British cave diving experts - including the two men who first located the boys a week ago - and rescue workers from Australia, China and other countries.
Image: A crowd watches as ambulances transport some of the rescued boysA crowd watches as ambulances transport some of the rescued boys to a hospital on Monday.Lauren DeCicca / Getty Images Three more boys were carried out in the hours that followed, according to a post on the Thai navy SEALs Facebook page.
At least nine ambulances loaded with stretchers and blue oxygen tanks waited by the mouth of the cave on Monday. The four evacuated on Monday were also hospitalized, although their condition was not announced.
Authorities declined to say how many boys would be extracted on Monday.
Although weak, they are largely in good health, authorities have said. "The boys' strength, the plan - today we are ready like before".
Officials said Sunday that it may "take days" to bring all 12 boys and their coach to the surface. Each of the rescued boys has been guided through the dark winding cave by two pairs of divers. Additionally, a weir, or low dam, was built outside the entrance to keep water levels low, as heavy monsoon rains threatened to fill it and the 2.4-mile escape route. They are still quarantined away from their parents, who have been able to see them through a glass window but not touch or hug them.
But the efforts to rescue the boys - aged between 11 and 16 - have proved a monumental challenge.
Anupong Paojinda said officials were meeting on Monday morning about the next stage of the operation and how to extract the remaining eight boys and their football coach from the cave in the country's north. Four boys and their coach remained inside the cave.
Thirteen worldwide divers and five Thai Navy SEALs are involved in the operation. A few hours later, Michael Safi, a Guardian reporter, confirmed that the sixth boy had been rescued.
On Sunday, divers held the first four boys close to bring them out, and each had to wear an oxygen mask to enable normal breathing, authorities said.
Workers have been working around the clock to pump water out of the cave, and authorities said Monday that heavy downpours overnight did not raise water levels inside.
The ordeal has riveted Thailand and captured the world's attention.
A spokesman for Musk's Boring Co. tunneling unit, which has four engineers at the cave, has said Thai officials requested the device, which could potentially help the children through narrow, flooded cave passageways.
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