Out of 13 Wild Boars soccer team members, eight have so far been rescued from the Tham Luang cave in northern Thailand's Chiang Rai. Rest five still remain trapped.
"The four boys rescued from the cave in Thailand on Monday were wearing full face diving masks while they were carried out of the cave to the make shift hospital nearby," an eyewitness, who is part of the rescue operations stationed at the entrance of the cave, was quoted as saying by CNN.
The eyewitness added that the boys were also wearing dive suits while being carried on stretchers .
"One of the major concerns is oxygen right now. They've been in an area where oxygen levels are low," said Dr Darria Long Gillespie of the University of Tennessee School of Medicine.
Earlier, heavy rains in Chiang Rai province threatened to further delay the rescue operations.
On Sunday, Chiang Rai Governor Narongsak Osotthanakorn had said that rescue operations would resume in the next 10-20 hours.
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Meanwhile, four boys were earlier rescued and admitted to the Chiang Rai Prachanukroh Hospital for medical treatment.
The footballers were found by the British divers on late Monday night, with footage showing them visibly weak and huddled on a mud mound deep inside the Tham Luang cave.
The party were strolling inside the cave, following which they were trapped for nine days, before being found. Aged between 11 and 16 years, the boys were members of the Wild Boar soccer team.