The Thai navy SEALs chant rang around the media centre opposite the site when news filtered through around 6.30pm local time on Tuesday that coach Ekapol Chanthawong, 25, was the last to be extracted from the cave after more than two weeks.
But the initial euphoria at finding them dissipated as authorities struggled to devise a safe plan to get them out, with the shelf more than four kilometres (2.5 miles) deep inside the cave and the labyrinth of tunnels leading to them filled with water.
Fifa boss Gianni Infantino had invited the boys' Wild Boars football team to Sunday's World Cup final last week.
Experts have previously said Musk's plans may not be of much use due to huge numbers of rescuers already working on the mission and their success in so far bringing eight out of the 12 boys to safety.
Federation Internationale de Football Association also expressed condolences to the family of a Thai Navy SEAL who died after running out of oxygen during the rescue operation on Friday.
Experts warned that drinking contaminated water or otherwise being exposed to bird or bat droppings in the cave could lead to risky infections.
According to Reuters, the children - they have low body temperatures and two have lung infections -will remain quarantined in a hospital for the next week to undergo testing.
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He also told reporters that the first four boys who were rescued are now able to eat normal food.
"The kids are footballers so they have high immune systems", Jedsada Chokdumrongsuk, permanent secretary at the Public Health Ministry, told a news conference. He added that all of them were generally healthy and in good spirits, thanks to their "high immunity" from playing football. "But we will have a psychiatrist to evaluate them", he said, while stressing that the boys are "happy and smiling".
The 53-year-old gave up a family holiday and made his way to Northern Thailand, where he scuba dived 4km through cold, dark and narrow passages to reach the boys and assessed them as medically fit to attempt the risky escape mission. He said they must be treated at the hospital for at least seven days.
Global rescue teams had worked around the clock after the boys were discovered by British divers, to try to drain the caves enough to rescue them.
US President Trump said their rescue was "a attractive moment". "Such a handsome moment - all freed, great job!"
Even before the final rescues, tributes began for the courage of the boys and their ability to survive the ordeal.
It was a "miracle" they had survived and an even greater one that the rescue team, including worldwide caving experts, were able to hatch a plan to get them out alive. Each of the nine chambers had a doctor waiting, and the boys were evaluated at each chamber.