When asked about his first reaction as he saw the first set of boys who were rescued he admitted that he was "very scared".
Four boys and the coach are still to be rescued.
The operation on Tuesday moved quickly, raising hopes that all 12 boys and their adult coach from the Wild Boars soccer team would be at the surface by the end of the day. The rescue effort is slowed somewhat by the fact that the team must replenish supplies and oxygen tanks that line the 2.5-mile route out of the cave. Last week, a former Thai navy diver died while preparing for the operation.
Cave-diving experts had warned diving the youngsters out was potentially too risky.
"The Prime Minister wants this to be a lesson, this should not happen again in Thailand", Narongsak said.
"They're asking for chocolate". If they're chloroformed, how could they come out? After more lab results are scrutinised, parents of the first four will after 48 hours be allowed to visit their children at their beds wearing protective gear.
Officials said all eight of the boys were healthy, though two of the four brought out Monday did have swollen lungs. It takes the divers about eight hours to get into the cave, reach the boys, and bring them back out. "But we will have a psychiatrist to evaluate them".
It was clear doctors were taking a cautious approach.
The boys underwent x-rays and blood tests and two who had signs of pneumonia were given antibiotics and are in a "normal state", he said, adding they will all remain under observation in hospital for a week.
John Tangkitcharoenthawon, a local village chairman, was bursting with happiness over the successful rescue.
Eight boys have now been rescued from the flooded cave labyrinth in northern Thailand. "Such a attractive moment - all freed, great job!"
The rescued boys are in "high spirits" and have strong immune systems because they are soccer players, a senior health official said, as rescuers prepared for a third push to rescue five still deep in the cave.
Musk said on Twitter: "Just returned from Cave 3. It is made of rocket parts & named Wild Boar after kids" soccer team.
It could be at least seven days before they can be released from hospital, Mr Jesada told a news conference.