"No, not today," said Narongsak Osottanakorn, governor of Chiang Rai province, after being pressured by journalists in the rescue efforts.
Authorities are considering a rescue plan involving an "immersion of friends" – where an experienced adult diver would swim with each child to evacuate team members, according to a US official familiar with the joint rescue operation.
Thai divers would lead the mission and US divers would preposition oxygen tanks, the US official said. The rescue team also includes divers and workers from Australia, the United Kingdom and other parts of Europe and Asia.
Thai military officials have been informed, the source said, and the country's prime minister, Prayut Chan-o-cha, was to be informed of the plan on Saturday morning.
The rescue mission could begin as early as the weekend, but no decision on whether to proceed has been made, the US official said.
Low levels of oxygen
On Friday, Thai Marine chief SEAL, Adm. Aphakorn Yoo-kongkaew, said oxygen levels in the cave had dropped to 15%, a level that a Thai doctor said that It represented a serious risk of hypoxia, the same condition that causes altitude sickness.
Gob. Osottanakorn said that "air is a major problem," but added that experts from the United Kingdom confirmed that the conditions in the chamber where the children were found were "good".
"Children can still walk, play comfortably," he said. "If (there is) heavy rain and the situation is not good, we will try."
Some of the parents of the children sent letters but the governor said he was not sure if the trapped children had read them.
Originally, the authorities had suggested the safest strategy for the affected team, from 11 to 16 years old, and their 25-year-old trainer would be to keep them in the Tham Luang Nang Non cave complex until the Monsoon season has passed in October and the water levels have decreased enough for them to be able to retire.
More rain is expected over the weekend, but the governor emphasized that rescuers would only try to free the team if the risk to their lives was minimal.
"We fear the weather and (lack of) oxygen in the cave, but we have to try to establish the plan and find which plan is the best."
Another possible rescue plan
A recovery The strategy that the rescuers have been pursuing includes equipping the group with full-face oxygen masks and accompanying them in a long and dangerous bath through narrow, black tunnels. Osottanakorn said the group was already "learning to dive," but they were not ready yet.
19659002]. The US official UU He said a plan to send oxygen to the camera where the boys are also suspended due to the challenge of wiring the cavern system.
Rescuers under pressure
The death of a rescue diver with experience in the cave system underscored the risks inherent in trying to move children.
Former Sergeant Saman Kunan, a former Thai SEAL, died at 2 a.m. on Friday (2 p.m. on Thursday ET), when returning from an operation to deliver oxygen tanks to the cave where the children are. The 38-year-old man was left without air while underwater, an officer said.
A military plane carried Kunan's body from Chiang Rai to the Satthahip naval base, where a funeral was scheduled, before a second at his home town in the province of Roi Et, north of Thailand.
Finnish volunteer diver Mikko Paasi, a long-time resident of Thailand, said Kunan's death had changed the mood on the ground how dangerous the mission had become.
"You can definitely feel it has an effect, but we're moving forward, we're all professionals, so we're trying to save it and keep it from happening again," he said, adding, "Everyone is focused on getting these guys out, keeping them alive or taking them out. "
One of Kunan's old friends, the sergeant. Anuram Kaewchano told CNN that he was surprised to hear the news.
I can not believe This has happened, "he told CNN by phone." I was in shape, I exercised every day and I was a triathlete. Our last trip together was to Malaysia. "
He said that the last time they spoke," we talked about the children, if they were out yet. "
The big operation to rescue the group involves dozens of SEALs from the Thai Navy, as well as experts and voluntary divers from parts of Europe and Asia, as well as from Australia and the USA
Members of the Wild Boar soccer team were reported missing two weeks ago after They did not come back from a field trip after soccer practice, but they were trapped when a sudden downpour flooded the narrow tunnels.
On Monday, two British divers found the 12 children and their children. carriage deep in the cave, perched on a rocky slab above the waters of the flood, after nine days without food or fresh water.
Rescue teams have been extracting millions of liters of water from the cave in an attempt to drain the cave, but the impending rains over the weekend threaten to undermine the work.
The monsoon season in Thailand runs from July to October and, although the last days have been relatively dry, the long-term forecast is rainy for months.
 Kocha Olarn of CNN reported from Chiang Rai, Euan McKirdy reported from Hong Kong while Lauren Said-Moorhouse reported from London. David McKenzie of CNN, Rebecca Wright, Ryan Browne, Karla Cripps and Jo Shelley, and inmates Pia Deshpande and Jessie Yeung contributed to this report.