Foreign and Thai Navy SEAL divers practised with them near the muddy embankment where the young footballers were found nine nights after walking into Tham Luang on June 23.
Another four were rescued on Monday and the last four boys and the coach were brought out on Tuesday.
He said a medic and three Seals in the cave, who have been looking after those trapped, will also come out.
The boys spent the time regaining their strength with food and drink and learning to dive for the risky mission, while rescuers pumped as much water as possible from the lengthy network of caverns. Tuesday, referring to the name of the trapped boys' soccer team.
This final mission aims to rescue the last remaining 4 members of the team, as well as their coach.
Two of the boys are thought to have lung infections, but there are no serious complaints to report.
He said the group can eat, move about, and talk. ABC News has identified the Wild Boar soccer team players Mongkol Boonbiam, Songpong Jaiwong, Ponchai Kumluang, Pipat Pothi, Duangpetch Promthep, Adul Samon, Panumat Sangdee, Peerapat Sompiangjai, Prajak Sutham, Nuttawut Takamsong, Chanin Wiboonrungrueng and Eakkarat Wongsukchan.
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Two more boys left the Tham Luang Nang Non cave complex a short time later and were transferred to a medical facility on site, followed soon after by a fourth boy, according to the eyewitness, who is stationed at the entrance to the cave.
"The 12 Wild Boars and coach have emerged from the cave and they are safe", the Thai navy SEAL unit said on its official Facebook page. After a long and risky rescue effort, the last members of the group were brought to safety today (July 10).
Heavy rains in the morning cleared during the day, a reassuring sign for rescuers who feared monsoon rains could imperil the rescue. In footage captured by the BBC, families of the boys were seen hugging in front of television screens in their homes, as residents in the nearby city of Chiang Rai lined the streets, clapping and taking videos of the ambulances carrying the last few boys to Chiangrai Prachanukroh Hospital.
They are still being quarantined from their parents because of the risk of infection and would likely be kept in hospital for a week to undergo tests, officials said.
The boys, aged 11 to 16, had no diving or scuba experience but quickly had to learn what they could. The governor of Chiang Rai state has been heading the rescue effort.
The remaining four boys and the 25-year-old head coach were rescued around Tuesday afternoon local time and were taken to a local hospital.