Expert divers entered the sprawling complex for the complicated and unsafe mission.
The rescue teams now needed at least 10 hours to prepare for their next operation, involving about 90 divers in total, 50 of them from foreign countries, he said.
The entire operation to get all 13 out of the cave could last two to four days, depending on weather and water conditions, army Maj.
Chiang Rai acting Gov. Narongsak Osatanakorn, who is heading the rescue, had said the second phase began at 11 a.m. Monday and authorities "hope to hear good news in the next few hours". The parents will not be allowed to hug or touch the boys until blood tests come back in about two days, officials said Tuesday.
Authorities in northern Chiang Rai province began the unsafe mission to bring out the 12 boys and their coach earlier on Sunday.
Responding to a question on Twitter, the entrepreneur and engineering mastermind said "divers who have made the passage", believe the pod is small enough to fit through the most narrow portions of the cave.
Thai authorities have confirmed that four members of the football team that was left stranded in a cave have now been rescued. "We have to be 100 percent confident that there is no risk to the boys before we evacuate", provincial governor Narongsak Osottanakorn said.
The boys, all members of the Wild Boars soccer team between the ages of 11 and 16, and their 25-year-old coach Ekkapol Chantawong were trapped inside Tham Luang cave on June 23 when sudden rains flooded their exit.
It is expected that the operation will continue in the next 12 hours.
"Air tanks and systems have to be put in place again", he added.
Eight of boys and the coach remained inside the Tham Luang Nang Non cave complex as authorities paused the global effort until Monday to replenish air tanks along the treacherous exit route. They eventually found a dry landing spot, where they waited for nine days before being found by two British divers.
Musk first tweeted about the boys trapped in the cave on 4 July after somebody asked him if he would assist. Thirteen medical teams were stationed outside the cave on Sunday -each with its own helicopter and ambulance - one for each of 12 boys and their coach. And many of them are experienced cave divers, which certainly helps because this is a very risky operation.
"It is important to appreciate that the United Kingdom cave divers continue to work alongside the Thai Navy SEAL divers and a combination of cave divers and open water divers from many other nations", the statement said. In addition to treatment areas, the hospital will also provide reunion rooms for the young boys and their families.
A frantic rescue mission was hatched in the week since they were found.
Adrian Mannarino came through in five sets against Daniil Medvedev , winning 6-4 6-3 4-6 5-7 6-3 to set up a clash with Federer. Keys, who was the US Open runner-up a year ago , crashed out 7-5 5-7 6-4 to the Russian on a baking hot Court Three.
Stephanopoulos said he asked Cohen if he had any regrets about how he has handled any of the matters under investigation. Trump said last month that he hasn't spoken to Cohen in "a long time" and that he was "not my lawyer anymore".
Most of the deaths were reported in Hiroshima and Ehime Prefectures, though eight prefectures were impacted. Abe told reporters on Sunday that the rescuers are battling time to save people in need of help.
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Mueller III is probing whether Trump campaign officials participated in the Russian interference. "He said he didn't meddle". Asked on Friday if the United States would recognize Crimea as part of Russia, Trump said: "We're going to have to see".
LeBron James' decision to sign with the Los Angeles Lakers immediately raised questions about the team's future . The Warriors have defeated James's Cavs in three of the last four NBA Finals including a 4-0 sweep last month.
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According to ABC affiliate WPLG in Miami, four of the people injured are being airlifted to Bayfront Health in Saint Petersburg. One American tourist was killed in the explosion, while two others are said to be in critical condition at a Bahamian hospital.
The regime has chipped away at rebel-held territory in Daraa since the escalation began nearly two weeks ago. About 100 civilians have been killed in the area since fighting began on June 19.
'Tiny Beryl' becomes first hurricane of the season
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Pompeo arrives in North Korea
Ahead of the summit, Pompeo said Trump would reject anything short of "complete, verifiable and irreversible denuclearisation". Add North Korea as an interest to stay up to date on the latest North Korea news , video, and analysis from ABC News.