They fought against mother nature to pump out floodwater and divert water flows amid Thailand's wet monsoon season.
Many of them spent more than two weeks in the cave as experienced divers launched their rescue mission to extract them.
Mr Turnbull asked Dr Harris to describe the trickiest section of the huge cave system he needed to navigate.
All will be discharged from hospital in the northern town of Chiang Rai on Thursday, he said.
We were lucky to visit the boys, coach and Seals and all the handsome medical and nursing staff in the hospital on our way home. "Thank you for all the moral support".
Dr Richard Harris wrote he and Craig Challen mused about the cave rescue mission on the way home to Australia.
"Dr Harris's efforts here are nothing short of absolutely exceptional and beyond and above the call of duty, but that's typical of numerous doctors that make up the medical profession in Australia", he said.
Eventually, through the collective effort of hundreds of rescue workers and many more across the world, pumping water, creating forward operating bases in sequential stages throughout the cave system, and devising a means of calming and transporting the children and their coach, the team was rescued on Tuesday, July 10.
Banphot Konkum, father of 13-year-old Duangpetch Promthep, told The Associated Press his son - better known by his nickname, Dom - said the team members didn't know rain had started falling after they had entered the cave on June 23.
The coach also dug them into the muddy wall to keep warm and sleep.
Nearly 100 divers were involved in the mission to extract the trapped boys from the cave. Some had pneumonia when they were brought out of the cave but were recovering, he said.
The 12 boys rescued from a flooded cave in Thailand are craving KFC's homestyle cooking, according to reports Saturday.
Tanawat Viboonrungruang, the father of the youngest boy, 11-year-old Chanin, told CNN on Friday that his son had just wanted to "visit the cave for an hour".
"The survivors expressed their thanks to the Thai Navy Seal by bowing to his picture".
The Australian team in Thailand also included Dr Harris's West Australian dive partner, six Australian Federal Police divers, a Navy clearance diver and members of the Department of Foreign Affairs and Trade Crisis Rescue Team.
"A lot of parasites will want them to sign the rights to books, to films", said Galleguillos.