The Facebook page of the Thai Navy SEALs, who have been central to the rescue operation, was updated Monday night to say "two days, eight boars" - a reference to the Wild Boars, the name of the boys' soccer team.
Nineteen divers are involved in the rescue attempt and officials said water levels remain stable, unaffected by the rain.
"All five will be brought out at the same time today", said the head of the rescue mission, Narongsak Osottanakornon, on Tuesday.
A crack team of foreign divers and Thai Navy SEALS guided the boys out through almost four kilometres of sometimes submerged, pitch-dark channels. Thai Prime Minister Gen. Prayut Chan-ocha visited the hospital Monday, and spoke to relatives and hospital workers.
Last month, 12 members of the Wild Boars soccer team and their coach became trapped in the flooded cave when they went exploring after soccer practice. In a drama that has received press coverage across the world, two British cave rescue specialists, workign with Thai military teams, found the 13 on a bank in a partly flooded chamber several kilometers inside the complex on Monday, last week. Having completed this section, the boys are then handed over to separate, specialist rescue teams, who help assist them through the remainder of the cave, much of which they can wade through.
The second group of four rescued on Monday are aged 12 to 14.
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Chiang Rai Gov. Narongsak Osatanakorn said he was thankful for Musk's support but the equipment was impractical for the rescue mission.
A Thai well wisher puts a poster to pray for boys and their soccer coach who have been trapped since June 23, in Mae Sai, Chiang Rai province, northern Thailand Monday.
The eight boys who've been rescued so far have all swum out of the cave, each escorted by two expert divers.
Two boys have minor lung infections and one had a fever, doctors have said.
The group will now be transferred to a hospital in Chiang Rai's state capital where they will stay for observation for at least seven days.
Doctors were being cautious because of the infection risk and were isolating the boys in the hospital.
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"The kids are footballers so they have high immune systems", Jesada said. "But we will have a psychiatrist to evaluate them".
Nargonsak said this phase may take longer than the previous two rescue missions, which took up to 11 hours.
At least nine ambulances and a convoy of other vehicles were at the cave site Tuesday.
But Governor Narongsak Osottanakorn, who is coordinating efforts to save the boys, said the machine is "not practical for this mission".
But with oxygen levels inside dropping to risky lows and the prospect of heavy rains flooding the area completely, authorities decided they had to move quickly, and take the group out through the water-filled tunnels.
But although the eight were rescued, there were concerns they may have contracted an illness while in the cave.
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A total of 393 people were recruited from 12 different centres throughout east Africa, South Africa, Thailand and the US. Mild side effects were common, and around 1% of people in the trial had more serious adverse reactions to the vaccine .
Officials scotched any chance of using tech billionaire Elon Musk's mini-sub made of rocket parts to rescue the remaining boys.