When asked whether the remaining five people would be brought out all at once on Tuesday, Osatanakorn said the rescue team's plan was "designed for rescuing four". But heavy rain overnight has increased the danger that the water levels in the caves will rise further, adding to the hazards of diving and potentially threatening the elevated bank of sand on which the football team are stranded.
Members of the trapped soccer team in a section of Tham Luang cave.
An ambulance has been seen leaving the site of the Thai cave where divers are carrying out what they hope is a final mission to bring out four boys and their soccer coach still trapped deep inside.
A doctor and three SEALS who had stayed with the footballers would also come out on Tuesday, he added. A massive worldwide search operation was launched and it took 10 days to locate the boys, who had taken shelter on a dry slope deep in the complex.
Positive medical reports on the rescued group further fuelled the sense of joy and optimism.
The SEALs said on their Facebook page that "the 9th Wild Boar was out of the cave at 4:06 p.m". After they were found on July 2, officials cautioned it could take some time to get them out, but authorities made a decision to act with heavy rains forecast to hit the region.
While the boys are in good health, two may have mild lung infection.
Officials said they had low body temperatures coming out of the caves.
He said a medic and three Seals in the cave, who have been looking after those trapped, will also come out. "They can have normal food but we are making sure it is easily digestible, not spicy or too strongly flavoured".
A massive global search operation was launched and it took 10 days to locate the boys, who had taken shelter on a dry slope, deep in the complex.
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Thai authorities said the four boys rescued from the cave are hungry but in good health.
The second group of four rescued on Monday are aged 12 to 14.
The boys and their coach went missing after football practice on 23 June, setting out on an adventure to explore the cave complex near the border with Myanmar and celebrate a boy's birthday.
Mr David Strike, a dive event organiser who has known Dr Harris for more than a decade, said Dr Harris had all the characteristics needed for the risky mission, with more than 30 years of diving experience.
The plight of the boys and their coach has drawn global attention, with divers, engineers and medics among others flying in from around the world to assist.
The first group has reportedly been allowed to eat chocolate and bread after requesting it.
The rescue missions take almost half a day to complete.
Divers have rescued eight of the boys.
Eight boys have now been rescued from the flooded cave - but four others and their football coach still remain trapped. In an Instagram video, he posted his journey through the pitch-black flooded cave, lit only by a few torch-lights. Officials had originally planned to keep the boys in the cave for months until water levels dropped, but realized that oxygen levels were dangerously low after the death of former Thai Navy Seal Saman Kunan, who died placing oxygen tanks in the unsafe cavern area.