Four boys were rescued Monday, the Thai navy confirmed, bringing the total rescued to eight since operations began Sunday.
They were taken to Chiangrai Prachanukroh Hospital where their four teammates rescued on Sunday had been tested and waiting for an all-clear.
Chiang Rai province's acting governor, Narongsak Osatanakorn, who is in charge of the rescue, voiced confidence Monday in the ongoing operation, provided the weather doesn't take a turn for the worse.
Earlier, Narongsak told a news conference a team had gone into the cave to rescue the remaining boys at 11 a.m. (0400 GMT), and he expected good news.
And although the four had been rescued, there were concerns they may have contracted an illness while in the cave, Narongsak said on Monday.
An ambulance believed to be carrying one of the rescued schoolboys leaves from Tham Luang cave complex on day two of the rescue.
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Getting to and from where the boys are has been an exhausting round trip, even for the experienced divers.
The journey had taken as long as five hours from the part of the cave where the boys are to the exit when the water level was high and the current was strong, but that was down to around 2 ½ hours by Sunday, Karadzic said.
"This morning they said they were hungry and wanted to eat khao pad grapao", Osotthanakorn said, referring to a Thai dish of meat fried with chili and basil and served over rice. Over the next three days, the boys were brought out in groups: four on the first day, four on the second and four, plus their coach, on Tuesday. They are all members of a youth soccer team called the Wild Boars. On Sunday four members of the "Wild Boar" team were successfully brought out from the cave, after authorities decided they had to rush ahead with a rescue operation to beat monsoon rains. Add Thailand Cave Rescue as an interest to stay up to date on the latest Thailand Cave Rescue news, video, and analysis from ABC News.
Interior Minister Anupong Paojina said the same divers who participated in Sunday's rescue conducted the operation Monday because they are familiar with the cave conditions.
Thai soldiers walk out from the Tham Luang cave area as operations continue for the 8 boys and their coach trapped at the cave in Khun Nam Nang Non Forest Park in the Mae Sai district of Chiang Rai province on July 9, 2018.
"You start to hallucinate, you see things, you hear things", said Dr. Robert Glatter, emergency physician at Lenox Hill Hospital. The most risky part is the first kilometer, during which the divers and boys are required to squeeze through a narrow, flooded channel.
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Authorities have so far refused to release the identities or conditions of the four who have escaped. He addressed the rescue mission on Monday at the unveiling of a new project in Bangkok, where reporters asked him how many days it would take to get the boys out.
They were discovered alive last Monday deep inside the flooded cave system.
As for the boys who have been rescued, they are in isolation and being monitored at a hospital for infection.
On Sunday, officials waited until several hours after the rescued boys had been transported to hospitals to announce their rescue.
"On behalf of the United States, congratulations to the Thai Navy SEALs and all on the successful rescue of the 12 boys and their coach from the treacherous cave in Thailand".
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