The boys and their coach set out to explore the vast Tham Luang cave complex after soccer practice on June 23, and got trapped when a rainy season downpour flooded the tunnels.
The latest boy to be rescued was spotted on a stretcher around 4:30 p.m. local time, according to CNN.
Thai military medical personnel walking inside a restricted area as preparations are made to transport rescued boys from Tham Luang cave to a hospital.
Thai authorities said the parents of the four rescued boys are still being kept from physical contact with them due to fear of infections.
Anupong Paojinda said officials were meeting on Monday morning about the next stage of the operation and how to extract the remaining eight boys and their football coach from the cave in the country's north.
The ambulance drove toward a helipad, where a helicopter was seen taking off shortly after to the cheers of the crowd below.
The generals and other officials overseeing the desperate operation to rescue 12 young soccer players and their coach from a flooded cave labyrinth in Thailand's sweltering far north were only half joking when they quipped Monday that success was in the hands of the rain god Phra Pirun.
Pad kra pao, a Thai chicken dish, was said to be the first meal that the four boys asked for.
Eight people remain trapped in the flooded cave system.
Less than an hour earlier, an ambulance with flashing lights had left the cave complex, hours after the start of the second phase of an operation to rescue the soccer team.
Authorities have refused to confirm names reported in local media, but in the small town of Mae Sai where the cave is located, it's all anybody is talking about. Over the next three days, the boys were brought out in groups; four on the first day, four on the second and five on Tuesday.
Each boy is being accompanied by two divers through the dark and complex cave system. Having completed this section, the boys are then handed over to separate, specialist rescue teams, who help assist them through the remainder of the cave, much of which they can wade through.
"The children complained that they were hungry and wanted holy basil stir-fried rice".
"I don't know if he is out, they didn't tell us", she said as she rested in a hut close to the mouth of the cave. Foreign Minister Julie Bishop this morning said lessons from the initial effort would be applied as two more groups of four are brought out of the cave.
"The next step is to make sure those kids and their families are safe because living in a cave has a different environment which might contains animals that could transmit any disease", a hospital statement said.
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. Visitors would need to wear sanitized clothes and stay two meters away from the children.
Officials lavished praise on the Thai and global divers who, in pairs of two, executed the risky rescue mission, guiding the boys, who could barely swim and had no diving experience, through a treacherous 2½-mile-long escape route that twisted and turned through the cavern.
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