While the names of those rescued have not been released, six of the boys are students at the Maesaiprasitsart School and classmates say they've been closely monitoring the worldwide mission to save them.
They were celebrating a second day of stunning triumph after divers guided four more boys Monday through tight passages and dank flooded caverns to safety.
"One of the things we have learned from previous research is that how young people are before they undergo an extreme experience like this is often a reasonably good predictor of how they will do later on after the event".
"Hooyah", the Thai Navy SEALs, who have played a crucial role in the against-the-odds operation, said in a Facebook post as they announced that a total of 8 members of the "Wild Boars" football team had been rescued on Sunday and Monday.
The footballers still awaiting rescue are about two kilometers further in, at a point very hard to access.
All the eight rescued survivors are now quarantined in the clean ward of the hospital.
The CEO of Tesla and SpaceX was - if his Twitter and Instagram accounts are to be believed - in Thailand on Monday touring the cave where a team of 12 soccer players, aged 11 to 16, became stuck with their coach on June 23.
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I don't think referees have been protecting him enough. For the whole world, it's more on Brazil . We're want to come up against the best".
The former governor of Chiang Rai province said he hoped for "100 per cent success" when the rescue resumes on Tuesday, with the mission now on hold again for up to 20 hours.
Musk said it was light enough to be carried by two divers, robust, and small enough to get through narrow gaps.
It appears that the team were going into the cave as part of an initiation ceremony which tasked the boys with reaching the end of the cave and returning having written their names on the far wall.
The boys smile as a Thai Navy Seal medic help injured children inside a cave in Mae Sai, northern Thailand.
In a race against time amid a heavy downpour, experts concluded their original plan to swim the boys out was the best option.
"So, it's not so much how they'll be feeling in the immediate aftermath - we would expect to see some strong reactions - or not - it depends upon many factors I don't know about. And we have more expertise than yesterday", he said. "If we bring five we have to change the plan".
The rescue operation began Sunday and has been progressing rapidly.
The death of military diver Saman Kunan on Friday underscored the huge risks the boys face. He had said fresh air tanks needed to be laid along the underwater route.