"Speaking to reporters on Friday, the governor of the Chiang Rai region, where the cave is situated, said the boys had enough strength to walk but could not swim to safety.
"Mr Narongsak said the boys were "OK" and the air they were breathing was good.
On Thursday their parents sent letters in for the boys to read - but the governor said he was not sure if these had reached them yet.
Rescuers have dug more than 100 holes, hoping to reach the cave by a direct route. There were 18 promising ones, the deepest at 400m, but Mr Narongsak said he was not sure if it would reach the boys, who are believed to be about 600m below the surface."
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"Mr Narongsak said discussions regarding the lowest risk rescue attempts were ongoing, but acknowledged that time was against them.
"We will try to set the best plan, when the risk is minimal, we will try to bring them out," he said.
He added that the rains had stopped in the past few days, giving the rescue operation some space to make several areas in the cave dry enough for rescue workers to access.
He also said that when teams had stopped pumping water for 12 minutes during the day on Friday, the water level in the cave rose by 10cm (4in)."
Thai boys 'can walk but can't dive yet'