The four rescued boys have been transported to a Chiang Rai hospital for treatment and medical evaluations, reported CBS.
Rescuers had planned to take a 10- to 20-hour pause in the rescue efforts to replenish the cave with oxygen and give the team of 18 divers leading the boys on the hard journey a chance to rest.
Narongsak said after the first four boys were rescued that they would be quarantined "for a while because we are concerned about infections". A spokesman for Musk's Boring Co. tunneling unit, which has four engineers at the cave, said in an email yesterday that Thai officials had requested the device.
They were guided by expert divers who plotted the hours-long escape through more than four kilometres (2.5 miles) of twisting passageways and flooded chambers.
Doctors attending to the eight boys who have been rescued from the cave in two groups of four on Sunday and Monday say they are generally in good health - an incredible result for the boys who have spent nine days incommunicado, without food, until they were found, and then waited days more before embarking on an hours-long dive that even the most skilled cave divers have described as among the most risky they have attempted.
Although the rescued eight were all presumed to be the boys, aged between 11 and 16, authorities did not reveal their identities nor confirm whether the coach remained inside the cave.
Workers have been laboring around the clock to pump water out of the cave, and authorities said Monday that heavy downpours overnight did not raise water levels inside.
The second phase of a rescue operation has ended for the day, with more than half of the Thai soccer team rescued from the cave. "This morning they complained that they are hungry and they asked for fried basil with rice", he added in front of global media. The boys rescued Sunday were described as strong and safe but needed to undergo medical checks.
At least one more boy has been rescued from Thailand's Tham Luang Cave as the harrowing mission to rescue the stranded children and their soccer coach stretched into its second day.
Five boys have been rescued till now, and divers are continuing with the rescue operations.
Four boys were extracted Monday, the Royal Thai Navy confirmed. Bancha Duriyapan told a news conference punctuated by applause from the dozens of Thai and foreign journalists and others in attendance.
A helicopter flies over Tham Luang cave as the rescue operation continues on Monday. The device could be used to rescue one boy at a time as it has space to fit in one person with his arms crossed, he said. "Some of them had gone to rest". Thai Navy SEALs and global cave diving experts brought out four boys Sunday, and the operation is continuing today.
On Sunday, officials decided they could no longer wait, as conditions were "as flawless as they will be".
The death Friday of a former Thai navy SEAL, Saman Gunan, underscored the risks.
He did not say how many boys the team hoped to bring out on Monday.