The boys, ages 11-16, and their 25-year-old coach became stranded when they went exploring inside after a practice game.
An operation to rescue a group of Thai boys and their soccer coach trapped in a flooded cave resumed on Monday, said several officials with knowledge of the operation at the Tham Luang cave in the northern Thai province of Chiang Rai.
Rescue efforts to free a group of trapped schoolboys from a cave in Thailand have now been underway for two days, and an eighth boy has now been freed from the unsafe complex.
A Reuters witness near the Tham Luang cave in the northern province of Chiang Rai saw medical personnel carrying two people out of the cave to waiting ambulances on Monday evening.
The soccer team had been trapped in the underground cave network since June 23, with flash floods causing water levels to rise, making it hard to get out.
They were equipped with spare air tanks, regulators, masks and wetsuits, and were prepared to lead the boys to comfortable above-water space if needed, he said, adding that it wasn't necessary. The hordes of global and local media have been kept back from the cave and the hospital in Chiang Rai, where the rescued boys are believed to be under observation.
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Musk replied: "I suspect that the Thai govt has this under control, but I'm happy to help if there is a way to do so". Rescuers have dug more than 100 holes, hoping to reach the cave by a direct route.
The mission to rescue a group of boys and their soccer coach trapped in the flooded cave since June 23 resumed hours earlier on Monday.
TRT World's John Joe Regan said the rescued boys - who remained in the cave without food for nine days - are weak "but they are doing well".
News of the release of the first four children on Sunday was greeted with elation in Thailand but rescuers say there are still significant risks with a majority of the boys still to undertake the risky 3.2km (2 mile) journey through the jagged, narrow and muddy cave.
How are the boys being rescued?
Sunday's mission involved 13 foreign divers and five Thai navy SEALs.
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Thailand's Interior Minister Anupong Paojinda said the divers who took part in Sunday's rescue were also conducting the current operation. Thai Navy SEALs later announced two more had been freed in what Gov. Narongsak Osatanakorn called a "very smooth operation".
Rains have been flooding the cave, making rescue challenging.
Thai authorities are being tight-lipped about who was inside an ambulance seen leaving the site of a flooded cave Monday, as they were the night before when four of the 13 people trapped inside the underground complex were rescued.
"I'm hoping for good news today", he said.
The cave complex is off-limits during the rainy season, which usually runs from May to October, when downpours can quickly flood it. Relatives said the boys had been inside the complex during the dry season.
Thailand's Health Secretary said last week that on arrival at the hospital the boys would need to be quarantined for one to two days before being allowed to see their families. Kanet said the boys will be treated as disaster victims and given psychological evaluations and other assistance after their ordeal.
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