This frame grab from video tweeted by Elon Musk shows a “tiny kid-sized submarine” being tested in a pool at Palisades Charter High School, Sunday, July 8, 2018, in Pacific Palisades, Calif. Musk’s Space X rocket company tested the submarine that could potentially help rescue the remaining children and their coach trapped in a flooded cave in Thailand. (Courtesy of Elon Musk via AP) 
In this image made from video taken Sunday, July 8, 2018, an emergency team carries a stretcher believed to be carrying one of the rescued boys from the flooded cave to a waiting helicopter in Mae Sai, Chiang Mai province, northern Thailand. Thailand’s interior minister says the same divers who took part in Sunday’s rescue of four boys trapped in a flooded cave will also conduct the next operation as they know the cave conditions and what to do. (Big Krean via AP) 
Two helicopters wait near the cave for more evacuations of the boys and their soccer coach who have been trapped since June 23, in Mae Sai, Chiang Rai province, northern Thailand Monday, July 9, 2018. Thailand’s interior minister says the same divers who took part in Sunday’s rescue of four boys trapped in a flooded cave will also conduct the next operation as they know the cave conditions and what to do. (AP Photo/Sakchai Lalit) 
A helicopter waits near the cave for more evacuations of the boys and their soccer coach who have been trapped since June 23, in Mae Sai, Chiang Rai province, northern Thailand Monday, July 9, 2018. Thailand’s interior minister says the same divers who took part in Sunday’s rescue of four boys trapped in a flooded cave will also conduct the next operation as they know the cave conditions and what to do. (AP Photo/Sakchai Lalit) 
Two ambulances arrive near the cave to wait for more evacuations of the boys and their soccer coach who have been trapped since June 23, in Mae Sai, Chiang Rai province, northern Thailand Monday, July 9, 2018. Thailand’s interior minister says the same divers who took part in Sunday’s rescue of four boys trapped in a flooded cave will also conduct the next operation as they know the cave conditions and what to do. (AP Photo/Sakchai Lalit) 
An ambulance with flashing lights leaves the cave rescue area in Mae Sai, Chiang Rai province, northern Thailand, Monday, July 9, 2018. The ambulance has left the cave complex area hours after the start of the second phase of an operation to rescue a youth soccer team trapped inside the cave for more than two weeks. (AP Photo/Sakchai Lalit) 
A Thai well wisher puts a poster to pray for boys and their soccer coach who have been trapped since June 23, in Mae Sai, Chiang Rai province, northern Thailand Monday, July 9, 2018. Expert divers Sunday rescued four of 12 boys from a flooded cave in northern Thailand, as a dangerous and complicated operation unfolded amid heavy rain and the threat of rising water underground. (AP Photo/Sakchai Lalit) 
A Thai well wisher put poster to pray for boys and their soccer coach who have been trapped since June 23, in Mae Sai, Chiang Rai province, northern Thailand Monday, July 9, 2018. Expert divers Sunday rescued four of 12 boys from a flooded cave in northern Thailand, as a dangerous and complicated operation unfolded amid heavy rain and the threat of rising water underground. The poster reads ” Take Wild Boars back home.” (AP Photo/Sakchai Lalit) 
An ambulance with flashing lights leaves the cave rescue area in Mae Sai, Chiang Rai province, northern Thailand, Monday, July 9, 2018. The ambulance has left the cave complex area hours after the start of the second phase of an operation to rescue a youth soccer team trapped inside the cave for more than two weeks. (AP Photo/Sakchai Lalit) 
An ambulance with flashing lights leaves the cave rescue area in Mae Sai, Chiang Rai province, northern Thailand, Monday, July 9, 2018. The ambulance has left the cave complex area hours after the start of the second phase of an operation to rescue a youth soccer team trapped inside the cave for more than two weeks. (AP Photo/Sakchai Lalit) 
An ambulance allegedly carrying one of the rescued boys head to the hospital in Chiang Rai city as divers evacuated some of the 12 boys and their coach trapped at the Tham Luang cave in the Mae Sai district of Chiang Rai province, northern Thailand, Monday, July 9, 2018. (AP Photo/Vincent Thian)
MAE SAI, Thailand | Four ambulances on Monday left the area around the flooded cave in northern Thailand where members of a youth soccer team have been trapped for more than two weeks, suggesting that a total of eight of the 13 trapped people have now been extracted.
Thai officials have been tight-lipped about the rescue operation, and would not comment on how many people were removed Monday.
On Sunday, when the high-risk rescue operation to rescue the 12 boys and their coach began, teams of divers brought out four of the boys but waited several hours before confirming their safe rescue.
Chiang Rai acting Gov. Narongsak Osatanakorn had said earlier Monday that the second phase began at 11 a.m. and authorities “hope to hear good news in the next few hours.” As of Monday morning, nine people remained trapped in the cave, including the team’s coach.
“All conditions are still as good as they were yesterday,” Narongsak told a news conference. “The boys’ strength, the plan — today we are ready like before. And we will do it faster because we are afraid of the rain.”
Authorities have been rushing to extract the boys, ages 11-16, and their coach from the cave as the annual monsoon bears down on the mountainous region in far northern Chiang Rai province. Workers have been laboring around the clock to pump water out of the cave, and authorities said Monday that heavy downpours overnight did not raise water levels inside.
The four boys pulled from the cave Sunday in an urgent and dangerous operation that involved them diving through the cave’s dark, tight and twisting passages were happy and in good health, authorities said.
“This morning they said they were hungry and wanted to eat khao pad grapao,” Narongsak said, referring to a Thai dish of meat fried with chili and basil and served over rice.
Still, the four were undergoing medical checks in a hospital in the provincial capital and were not yet allowed close contact with relatives due to fear of infections. Relatives were able to see them through a glass partition, the governor said.
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. A massive international search operation was launched and it took 10 days to locate the boys, who had taken shelter on a dry slope deep in the complex.
The search and rescue operation has riveted people both in Thailand and internationally, with journalists from across the globe traveling to this town along the border with Myanmar to report on the ordeal.
Interior Minister Anupong Paojinda had said early Monday that the same group of expert divers who took part in Sunday’s rescue would return to extricate the others because they know the cave conditions and what to do. He had said fresh air tanks needed to be laid along the underwater route.
Authorities have said extracting the entire team from the cave could take up to four days, but Sunday’s success raised hopes that it could be done faster.
Sunday’s mission involved 13 foreign divers and five Thai navy SEALs. Two divers accompanied each of the boys, all of whom have been learning to dive only since July 2, when searchers found them.
Cave rescue experts have said they consider an underwater escape to be a last resort, especially with people untrained in diving.
The death Friday of a former Thai navy SEAL underscored the risks. The diver, the first fatality of the rescue effort, was working in a volunteer capacity and died on a mission to place air canisters along the passage to where the boys are, necessary for divers to safely travel the five- to six-hour route.
There were several concerns that prompted authorities to move forward with the plan to dive the boys out. One was that it was unknown how safe and dry the area where they had taken shelter would stay as Thailand’s rainy season, which lasts until at least late October, picks up pace.
The other, and perhaps more worrying, was that oxygen levels in the complex were falling close to dangerous levels.