The anesthetist, from Adelaide, has been hailed as a "hero of the Thai people" after all 12 boys and the coach, 25, were freed from the cave complex in Chiang Rai on Tuesday after an arduous mission.
The search for the boys and the daring operation to rescue them caught the attention of wide audiences across the globe and the drama has now inadvertently come to focus on the plight of almost half a million people in Thailand who are stateless.
The South Australian doctor, who is part of a small team of expert Aussie cave divers who have reached an nearly legendary status in their field, was the last person to leave the Tham Luang caves after the Wild Boars soccer team was rescued.
One parent said the boys were actually on higher ground than the small ledge where they were located, but came down when they saw someone coming.
Earlier reports said the boys would be discharged from the hospital on Thursday.
British diver John Volanthen, 47, who found the boys and their coach inside the cave system, said Dr Harris" bouncy Australian accent was "relaxing and reassuring' to the boys.
Dr Harris received an outpouring of support after it emerged his father had died just hours after rescue.
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After their traumatic ordeal deep inside a dark and flooded mountain cave, Thailand's 12 rescued boys and their young soccer coach will now have to navigate a fresh challenge: fame.
"We were very relieved that they were all alive but I think at that point we realised the enormity of the situation and that's perhaps why it took a while to get them all out". But a rainy season downpour flooded the tunnels, trapping them.
He warned relatives of the boys to resist giving interviews to media over fears they could have a negative impact on their mental health.
A team of Royal Thai Navy members, a doctor and a nurse stayed with the group, giving them high-powered protein drinks and medical assessments, while rescuers worked on a plan to get them out as safely and quickly as possible.
One heroic man gave his life to save the children in his rescue effort according to Reuters, former Thai navy SEAL Samarn Kunan, who left behind a loving wife.
The rescue was greeted with joy by some of the world's biggest football clubs.
Last week, Manchester United invited the Wild Boars to watch a match at Old Trafford.
'This is clearly a time of grief for the Harris family, magnified by the physical and emotional demands of being part of this week's highly complex and ultimately successful rescue operation. About 4,000 volunteers on Sunday were taking part in a clean-up of the area around the Tham Luan Nang Non cave.