"If the oxygen levels are down and the carbon dioxide levels are up, then you can get too much carbon dioxide in your blood". "Even the most highly trained individuals can have problems", said Monty Fitzpatrick, owner of Scuba Shack and a Scuba safety training expert.
The first page of the notes, written by assistant coach Ekkapol Chanthawong, says: "What we want to communicate: The kids say don't be anxious about them. I also sincerely apologise to the kids' parents".
The boys were found inside the cave by British rescue divers on Monday, 10 days after they went missing. More than 100 chimneys are being drilled into the mountain to reach the team, rescue operation chief Narongsak Osottanakorn said on Saturday.
"The environment inside the cave is challenging".
Some of the trapped boys praying in the cave in Tham Luang.
A senior army commander, Maj. Monsoon flooding cut off their escape and prevented rescuers from finding them for nearly 10 days as the only way to reach them was by navigating dark and tight passageways filled with muddy water and strong currents.
However, despite concerns of falling oxygen levels inside the cave, Governor Osottanakorn said that United Kingdom experts had suggested that the chamber where the children, aged between 11-16, were located were "alright". At this time though, diving is the only possible method of escape, even though cave rescue experts warn it is extremely unsafe even for those with experience. The rescue team also includes divers and workers from Australia, the United Kingdom, and other parts of Europe and Asia.
Following a relatively dry spell, fresh torrential downpours could pose a setback to rescuers who have struggled to drain the Tham Luang cave complex in the northern province of Chiang Rai.
Location where 12 young soccer players and their coach are trapped inside a complex cave system.
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A diver who spent time with the boys said the youngsters wanted to know the results of the matches. This is made all the more complicated by the fact that the coach and numerous boys can't swim. They've practised wearing diving masks and breathing, in preparation for the diving possibility.
Thai officials had been leaning in their public statements toward a quick underwater evacuation because of fear that access to the cave could soon close again because of seasonal monsoon rains expected this weekend. All the divers are taking good care of them.
Despite the unfortunate death, the volunteers have vowed to continue providing the boys with oxygen as the planned extraction, which involves the boys swimming out of the cave with divers, could still take months.
The oxygen inside the cave is also said to be running out.
Rescuers began the mission at 10am on Sunday (local time) and it would take many hours before the first boy emerged from the cave, Narongsak Osottanakorn told reporters. During this time they have been unable to communicate with their parents. I'll be away for just two weeks. Bew disappeared for two weeks.
But the rain had begun to fall.
"Not today because they can not dive at this time".
Katadzic has not dived the final kilometer to where the boys are stranded on a muddy bank.
"We are carrying oxygen canisters to where the boys are", Narongsak said.
Several rescuers can be seen struggling through dark, narrow passages.