The youngest, 11, appeared asleep under a crisp white sheet. He said, "Don't need to worry about their physical health and even more so for their mental health".
"It might be because they were all together as a team", public health ministry inspector general Thongchai Lertwilairatanapong told reporters.
The nerve-shredding three-day mission ended on Tuesday with the final group of four boys and the coach emerging from the cave which had held them captive for 18 days. Three have slight lung infections.
The SEALs commander, Rear Adm. Apakorn Youkongkae, said the soccer coach, Ekkapol Chantawong, determined the order the boys should be rescued in. "I don't have any details about when they were being transferred from the cave", he said. "The coach was the one to choose".
The Wild Boars soccer team and their coach went missing on June 23 in the Tham Luang Nang cave in northern Thailand following a flash flood.
Thirteen worldwide cave divers joined five Thai Navy SEALs in the risky rescue operation.
The dangers of the rescue were brought into sharp relief last Friday by the death of a retired Thai Navy SEAL as he ran out off air in the flooded cave complex as the extraction plans were being laid. The rescued boys had not been identified out of respect for the families whose sons were still trapped, officials had said.
Divers practised their rescue techniques in a swimming pool with local children about the same height and weight as the members of the Wild Boars soccer team trapped in the cave.
Here are some of the heroes who took part in the rescue mission.
"The area will become a living museum, to show how to operation unfolded", Narongsak Osottanakorn, the former governor and head of the rescue mission, told a news conference.
Footage of divers pulling the last boys to safety from the flooded cave.
Falling oxygen levels, risk of sickness and the imminent prospect of more rain flooding the cave complex for months meant "the long-term survivability of the boys in the cave was becoming a less and less feasible option", Anderson said.
Police officers took photographs of each other at the massive cave entrance, as pumps continued to suck out huge volumes of water.
The first people to find the 12 boys and their coach were British divers John Volanthen and Richard Stanton. They survived the nine days before they were found by drinking water dripping from the cave walls, officials said.
"Our operation was more successful than we expected", Narongsak said at a press briefing.
However, Prime Minister Prayuth Chan-ocha has said precautions would have to be implemented both inside and outside the cave to safeguard tourists.
The government's efforts, the assistance of people in Thailand and overseas, and the outpouring of moral support made the mission a success, Prayuth said in a televised national address.