The rescue operations to extricate the remaining trapped eight boys and the coach of the Wild Boars soccer team from the Tham Luang cave in northern Thailand's Chiang Rai resumed on the second day on Monday.
"The operation has begun and it is ongoing at the moment," a Thai navy official was quoted by CNN, as saying.
The official added that the same set of divers, who rescued the four boys, have gone into the cave.
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.
Addressing a press conference after the completion of the first day of the rescue operations, Osotthanakorn had said that the divers would focus on replacing the oxygen tanks so that the rescue operations would resume for the remaining boys and the coach of the soccer team, CNN reported.
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Describing it as a "very smooth operation", the Chiang Rai Governor had said the authorities were to make sure that all conditions were stable for the next phase of evacuations.
Meanwhile, four rescued boys have been admitted to the Chiang Rai Prachanukroh Hospital for medical treatment. The hospital is situated an hour away from the Tham Luang cave.
Eve Tapanya from the Thai Tourist Police had said that the rescued boys' conditions were "not that bad and they're ok."
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.
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