But scattered monsoon rains continued to risk percolating through the limestone cave walls to flood the tunnels with water.
The 12 boys and their coach rescued over the past three days "took care of themselves well in the cave", Thongchai Lertwilairatanapong, a public health inspector, said at a news conference at the hospital in Chiang Rai city where the group is recovering.
He was taken by helicopter and then ambulance to the hospital in Chiang Rai were the first four boys, who were rescued on Sunday, are now being held in quarantine as they undergo tests.
Tech-billionaire Elon Musk also said that he has visited the site of the rescue operation and has delivered them a mini-submarine to be used if necessary.More news: France advance to 2018 World Cup final
The operation on Monday went more smoothly than on Sunday and took two hours less as the practice became more refined, he said.
Musk has been tweeting about the rescue mission for the last few days. "And it is up to the environment. But if the rain god doesn't help, then it could be challenging". "Thinking about how they've been kept in a small cave for two weeks, they haven't seen their mums", Ivan Karadzic, who runs a diving business in Thailand and has been involved in the rescue mission, told the BBC.
Narongsak said: "Today is D-Day". "We should learn from this experience to prevent it from happening again".
The "Wild Boars", aged between 11 and 16, and their 25-year-old coach were trapped on June 23 while exploring a cave complex in the province of Chiang Rai when a downpour flooded the passageways.
One of the more hard parts in getting out of the cave system is a bottleneck that is only 38cm by 72cm at its smallest - so narrow that divers have to remove their tanks to fit through the gap.More news: Amesbury incident: woman exposed to nerve agent dies
Saman Gunan was a retired Thai navy diver who was volunteering in the rescue efforts.
Police and military personnel use umbrellas to shield a rescued boy beng transferred on a stretcher from a helicopter to an ambulance after he emerged from the Tham Luang cave.
Later this week, the Discovery Channel will be airing a one-hour documentary chronicling the team's weekslong ordeal: "Operation Thai Cave Rescue" premieres at 10 p.m. ET/PT on July 13.
Authorities had closely guarded the details of the boys' condition, who will be monitored in hospital for a week.
"The rescue has been enormous", said volunteer helper Somjit Saenset, 56. "I'm so happy the children came out safely".More news: Donald Trump claims Germany 'totally controlled' by Russian Federation , airs list of grievances
Two more boys are rescued from the cave. They will remain in hospital in the nearby city of Chiang Rai for a week, followed by a week's recuperation at home. Officials also said they are taking less medication, and can eat anything they want - good news for the boys who were looking forward to fried rice with basil.
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