Rescuers have been unable to extend a hose pumping oxygen all the way to where the boys are, but have brought them some oxygen tanks.
"It was sad news".
"They can not dive at this time", Chiang Rai Gov. Narongsak Osottanakorn told reporters late Friday. "His job was to deliver oxygen".
Thai authorities have since said they have a limited amount of time to rescue the group, particularly as oxygen levels within the cave are declining and rain is continuing to deluge the area.
"We are supporting the frogs team. we have medical teams and divers from the navy with us", Samarn said, referring to Thai military divers by their nickname. His body was sent to Bangkok, where he would receive a royal-sponsored funeral.
Thousands of rescue workers, police, soldiers, electrical engineers, volunteers and journalists are camped out here in the muddy terrain of this mountainous Thailand province.
It is the first message from the coach, whose role in the team's predicament has split Thai social media.
The diver, the first fatality of the rescue effort, was working in a volunteer capacity and died on a mission to place oxygen canisters along the route to where the boys and others are sheltered.
"We are trained to expect risks at anytime". "We won't let the life lost be wasted". Ukrainian diver who participated in the search for children trapped in the cave of Thailand. The boys are said to be too weak from malnutrition to even make the trek.
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Rescue crews have also determined that it's impractical to bring into the cave the necessary amounts of food and supplies that are required to sustain the boys and their coach before the oxygen levels drop to fatal levels or the water level rises.
"Regarding the plan for the 13 to swim or dive, there is only one critical point which is risky: It is where every boy has to dive alone", Chiang Rai Governor Narongsak Osottanakorn said on Thursday.
Narongsak said experts told him flooding from new rain could shrink the unflooded space where the boys are sheltering to just 10 square meters (108 square feet).
The boys have asked the navy SEALs taking care of them in the cave for details about what has happened in the World Cup since they got trapped June 23.
Thai Navy Seal/Handout via REUTERS TV Boys from the under-16 soccer team trapped inside Tham Luang cave greet members of the Thai rescue team in Chiang Rai, Thailand, in this still image taken from a July 3, 2018 video by Thai Navy Seal.
The Navy source said boys' biggest challenge would be a 200m stretch of the completely flooded cave that made up part of the 600m section between "Pattaya Beach" and chamber three.
"The current situation, with the air and water levels and the boys' health, is the best yet", he added.
The members of the Wild Boar soccer team were reported missing two weeks ago after they didn't return from an outing after soccer practice.
It takes even experienced divers six to seven hours to complete the round-trip from forwarding command in the third cave chamber to the boys huddled on a ledge deep inside the complex at Noem Nom Sao.