In the middle of such incredible danger and potential tragedy, the most extraordinary, uplifting story of hope and humanity has also emerged.
The ABC reports that Harris and three Navy SEALS were the last out of the cave following the rescue of the 12 boys and their coach, emerging several hours after the last of the soccer team.
Nineteen divers are involved in the rescue attempt and officials said water levels remain stable, unaffected by the rain.
But Thai authorities have been coy on how a group of boys, many of whom could not swim and none with diving experience, could have navigated the treacherous narrow and submerged passageways of the Tham Luang complex, even with expert diving support. The eight boys brought out on Sunday and Monday are in good health overall, though two are suffering from pneumonia, according to hospital staff cited by AP.
Thais reacted with relief, gratitude and exhilaration after the last group of the Wild Boars football team was rescued from the Tham Luang cave, near the border with Myanmar, on Tuesday night, ending an ordeal that gripped Thailand and the world.
The freed children are all now recovering in hospital and were earlier reported to be in a stable condition.
If medical tests show no dangers after another two days, parents will be able to enter the isolation area dressed in sterilized clothing, staying 2 meters (yards) away from the boys, said another public health official, Tosthep Bunthong.
Doctors had feared the boys might be exposed to diseases carried by bats, a fungal infection sometimes called "cave disease", or water-borne bacterial disease leptospirosis during the prolonged period they spent underground. However, it can not be spread between humans.
An Australian Defence Force spokesman said Dr Harris, who made key assessments of the 12 boys on Saturday to greenlight the rescue operation, would not be speaking to the media.
"I am very happy about those who already made it out and I think everyone will be out today", said Waranchit Karnkaew, 14, who also said the football-mad boys had been closely following games at the World Cup in Russian Federation before they were trapped.
A Thai well wisher puts a poster to pray for boys and their football coach.
The global soccer federation, FIFA, had already invited the boys to attend the World Cup final in Russia this Sunday. This seems less likely now given the need for the boys to undergo further tests.
Richard Harris, a world-renowned medic and diver.
But while they are out of the cave, and doing just fine - considering what has transpired - the "Wild Boars" football team members and their coach have a way to go yet before their lives return to a semblance of normality. Mini-sub is ready if needed.
"Hooyah! Mission accomplished", read one headline, echoing the rallying cry of the SEAL unit. "Leaving here in case it may be useful in the future".
Prayuth gave a televised national address Wednesday, saying the government's efforts, the assistance of people in Thailand and overseas, and the outpouring of moral support made the mission a success.