The eight boys have not been seen in public, but have been pronounced to be in reasonable health.
But rescuing the remaining five people, which includes the boys' 25-year-old soccer coach, could take more than one operation, Narongsak said.
Poonsak Sripiromrak, who runs a shop selling gems, jewelry and religious statues in Mae Si, said the story has kept everyone in town on edge for the more than two weeks since the boys first went missing.
The death Friday of a former Thai navy SEAL underscored the risks.
Authorities are unable to say whether all five will be brought to the surface together as they continue to navigate the risky rescue operation.
Experienced cave rescue experts consider an underwater escape a last resort, especially with people untrained in diving, as the boys are.
Twelve young boys and their soccer coach were trapped in a cave in northern Thailand by floodwaters more than two weeks ago.
"The operation is being supervised by the Thai authorities". Musk expects his submarine to arrive in the middle of that window - about 12 hours into the second phase of the operation.
A device by Elon Musk's SpaceX and The Boring Company, created to help rescue the remaining members of a soccer team trapped in a flooded cave in Chiang Rai, Thailand, is being tested in a swimming pool in Los Angeles, California, in this still image taken from an undated video obtained from social media. It was unclear who was inside the ambulance or the helicopter.
Officials said Monday that the first four rescued boys were all "good and happy" after spending 16 days trapped inside the cave but that they were complaining of being "hungry". It takes several hours. They were in good condition in hospital, officials said.
Meanwhile, a letter of apology from the coach of the football team was delivered to the boys' parents via the cave divers.
Polar's fitness app exposed its users' sensitive location details
However, with enough digging, Polar's tracking info also exposes its users' names and home addresses. This included the location details of soldiers and secret agents .
The boys and their coach went exploring in the massive Tham Luang Nang Non cave on June 23 after a soccer practice, and were cut off when a rainstorm flooded the cave.
The mission was paused overnight on Sunday for air tanks to be replaced.
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.
British divers Richard Stanton and John Volanthen discovered the boys on Monday.
Four of the boys were safely rescued on Sunday after rescuers carried out a risky operation, amid fears the waters will rise again to a unsafe level.
Musk shared a video demonstrating a "tiny, kid-size submarine" being used to transport a person across a pool.
The rescued boys will be in quarantine for at least 24 hours, Tracy reports.
Authorities spent hours replenishing air tanks along the cave's treacherous exit route. Thai Prime Minister Prayut Chan-ocha was scheduled to make a second visit to the scene late on Monday and the president of soccer's governing body, FIFA, Gianni Infantino, today invited the boys to the World Cup final in Moscow on Sunday if they make it out of the cave in time.
Authorities on Monday confirmed that water inflows into the cave remained at controllable levels while drainage efforts continued.
Expert divers on Sunday managed to get four of the 12 boys to safety.
Ambulances parked on standby outside the hospital in Chiang Rai province. Heavy rain has struck the region intermittently over the last three days and further downpours could set back draining efforts at the cave.
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