"The rescue operation chief said Sunday that efforts were paused overnight because workers used all the oxygen" and needed to reset their air tanks, and he gave a time frame that suggested it could resume Monday morning local time (Sunday night ET).
On Sunday, divers held the first four boys close to bring them out, and each had to wear an oxygen mask to enable normal breathing, authorities said.
Officials told Reuters that Monday's rescue operation would take between 10 and 20 hours.
Those rescued Sunday traveled more than half a mile underwater with the first one coming out of the cave at 5:40 p.m., Chiang Rai Gov. Narongsak Osottanakorn, the head of the rescue mission, said Sunday.
Narongsak said that there was no time limit on the rescue and that its progress would depend on weather and conditions inside the cave, but expected it to last through Monday.
"I would like to inform the public at home and those who have been giving us support all along, after 16 days, today's the day we've been waiting for, we are seeing the Wild Boars in the flesh now".
He was taken by helicopter and ambulance to the same hospital in Chiang Rai where the first four boys rescued Sunday by a team of worldwide and Thai dive experts are being treated. In some places, the boys had to be carried under flooded areas, some only as narrow as 0.6 meter wide.
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The boys and their coach went exploring in the massive Tham Luang Nang Non cave on June 23 after a soccer practice, and were cut off when a rainstorm flooded the cave. After Monday's rescue effort, four boys and their coach were still inside the labyrinth cave.
Rescuers at a Thai cave where eight boys and their soccer coach remain trapped have awoken to cloudy skies, after a night in which heavy monsoon rains lashed the mountainous region for several hours. Prime Minister Prayut Chan-O-Cha, who paid a visit to the site on Monday evening, also turned up at the hospital to meet the rescued boys.
The four boys rescued on Sunday were each accompanied by two divers as they were gradually extracted from the cave.
The journey through the snaking cave system is highly risky, as the death of a former Thai navy diver on Friday proved. They eventually found a dry landing spot, where they waited for nine days before being found by two British divers.
Authorities have not confirmed the identity of the first four boys freed.
Authorities have repeatedly said the rain could re-flood crucial parts of the cave complex that have been drained and make the escape route much harder or even impossible to navigate.
The last video shows the process of removing the submarine from the pool and the team unlocking the door, before the passenger, arms crossed, slides out. The group set out to explore the cave complex, but became trapped by rising waters.