Rescuers will take no risks in freeing the 12 boys and their football coach trapped in a flooded cave in Thailand, an official said.
They have received their first food and medical treatment in 10 days.
Seven divers, including a doctor and a nurse, joined the group inside the caves in the north of the country after they were discovered alive on Monday.
Rescuers are now considering how best to bring the group to safety.
"We will not rush to take the lads out of the cave," the governor of Chiang Rai, Narongsak Osoththanakorn, told reporters, adding: "Whoever has zero risk first can leave the cave first."
More heavy rain could see water levels rise and threaten the air pocket where the group has taken refuge.
The boys were found nine days after they entered the caves in Chiang Rai province following a football training session and became trapped by rising waters from heavy rainfall.
On Tuesday, Thai officials told reporters that rescuers were providing health checks and treatment, and keeping the boys entertained, adding that none of those trapped were in a serious condition.
"They have been fed with easy-to-digest, high-energy food with vitamins and minerals, under the supervision of a doctor," Rear Admiral Apagorn Youkonggaew, head of the Thai navy's special forces, told reporters.