Each of the rescued boys had two divers with them at all times during the operation.
Narongsak Osottanakorn, the governor of the country's Chiang Rai Province and the leader of the rescue mission, said the dive team is working with doctors to determine the order of exit, per Forgan.
He said the rescue operation was pausing for about 10 to 20 hours to check the escape route again for safety before being resumed.
Divers have previously described conditions in the cave network as some of the most extreme they have ever faced.
The risky operation to rescue the 12 boys and their coach began early Sunday morning and the entire operation involves 90 expert divers from around the world.
The rest of the Thai soccer team and their 25-year-old coach remain inside the Tham Luang Nang cave.
A helicopter flew the four boys to the nearby city of Chiang Rai, where they were taken by ambulance to hospital.
It's part of an effort to evacuate the 12 boys from the team along with their coach, in a rescue that has captured the world's attention, with reporters flocking to the scene and foreign divers arriving to assist.
The rescue mission has concluded for the night.
The order to leave the site came as irritation over the media presence grew, and a day after the rescue mission chief said conditions were flawless for the evacuation to begin.
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Eight Australian divers, six from the Australian Federal Police, are part of the 90-strong Thai and global diving team taking part in the operation.
Musk said on Twitter a team from his rocket company SpaceX in Los Angeles was building a "tiny kid-size submarine" to help with the rescue, although gave a timeline that suggests it would not arrive in Thailand until Monday at the earliest.
The initial search was conducted by military divers, who were later joined by a group of 30 personnel of the United States Pacific Command and British cave diving rescue experts Richard Stanton, John Volanthen, and Robert Harper.
His parents, who along with other families, have maintained a constant vigil at the site since the boys first became trapped. The Thai navy confirmed to the Guardian that the first two boys were freed late on Sunday afternoon and then airlifted to Chiang Rai city, which is about 50 miles from the cave.
A member of the rescue operation prepares a stretcher in a restricted area at the base camp near Tham Luang cave.
Two divers would accompany each boy, guided by rope.
"The teams here are happy the boys are being rescued but also anxious about the severity of the boys' conditions".
Now, while no further rescue efforts can be carried out on Sunday, there has been a breakthrough as the boys were retrieved.