They were found 10 days later, huddled on a small, dry shelf just above the water, and divers and other global rescuers plotted the complex mission to rescue the team before more rain came.
Students of Mae Sai Prasitsart School, where some of the schoolboys study at, celebrate after the 12 soccer players and their coach were rescued from the Tham Luang cave complex, in the northern province of Chiang Rai, Thailand, July 11, 2018.
A new video has emerged showing the rescued Thai boys wearing hospital gowns, face masks and waving at their parents and loved ones.
"And be careful in the future", Jason Mallison, a diver for the British Cave Rescue Council, said when asked by reporters in Thailand if there was anything he wanted to tell the rescued members of the Wild Boar soccer team.
Samarn, an emergency rescue worker at Bangkok's Suvarnabhumi Airport after he left the SEALs in 2006, joined the cave rescue operation on July 1.
The team's morale was hit when a former Thai Navy SEAL, Samarn Kunan, 38, died while helping lay out oxygen tanks underground.
"Some of them were asleep, some of them were wiggling their fingers".
Mr Stanton said the toughest part of the mission was bringing the boys back through the passage and admitted he was not certain they would succeed.
When news arrived after nine days that all twelve boys and the coach had been found, his mother said: "Thank you to God".
Junta leader Prayut Chan-O-Cha on Tuesday said the boys had been given a "minor tranquilliser" to prevent anxiety during the complex extraction bid.
The provincial governor on Friday denied any favoritism in considering citizenship for three members of the football team rescued from Luang cave, as the government pledges to speed up the process.
It's not clear if the museum would be operational all year round, as Thailand is prone to heavy floods during the monsoon season, which lasts from June until October.
Then, with the final divers slowly exiting the cave on Tuesday, the pumps suddenly failed pushing the water level up towards head height in a previously wadeable section of the cave. When divers reached them later, they brought additional food, water and blankets.
Thailand spent yesterday celebrating the successful mission.
Health officials said the boys, aged 11 to 16, would spend at least a week in hospital and some 30 days recovering at home following their ordeal.
The exact mechanics of the rescue bid were closely guarded during the operation, but details have since dribbled out.
Mr Volanthen's mother, Jill, said: "We are absolutely so proud, but my sympathy is with the wife and family of the diver who lost his life".
The boys were held close to divers and remained motionless for parts of the journey where they had to dive.