This Monday, July 2, 2018, photo released by Tham Luang Rescue Operation Center, shows the boys and their soccer coach as they were found in a partially flooded cave, in Mae Sai, Chiang Rai, Thailand. The 12 boys and coach found after 10 days are mostly in stable medical condition and have received high-protein liquid food, officials said Tuesday, though it is not known when they will be able to go home. (Tham Luang Rescue Operation Center via AP)
This Monday, July 2, 2018, photo released by Tham Luang Rescue Operation Center, shows the boys and their soccer coach as they were found in a partially flooded cave, in Mae Sai, Chiang Rai, Thailand. The 12 boys and coach found after 10 days are mostly in stable medical condition and have received high-protein liquid food, officials said Tuesday, though it is not known when they will be able to go home. (Tham Luang Rescue Operation Center via AP)

Mae Sai, Thailand — Heavy rains forecast for northern Thailand could worsen flooding in a cave where 12 boys and their soccer coach are waiting to be extracted by rescuers, possibly forcing authorities to have them swim out through a narrow, underwater passage in the cavern, a top official said on Tuesday.

The 13, who disappeared when flooding trapped them in the cave they were exploring on June 23 after a soccer game, were found by rescue divers late Monday night in the cavern in northern Chiang Rai province during a desperate search. The effort drew international help and has riveted Thailand.

The boys, aged 11-16, and their 25-year-old coach were described as healthy and being looked after by seven members of the Thai navy SEALs, including medics, who were staying with them inside the cave. They were mostly in stable condition and have received high-protein drinks.

While efforts to pump out floodwaters are continuing, it’s clear that some areas of the sprawling cavern cannot be drained, said Interior Minister Anupong Paojinda, a member of Thailand’s ruling military junta. In order to get them out ahead of the bad weather forecast for later in the week, they might need to use diving gear while being guided by professional divers, he said.

Anupong said the boys would be brought out via the same complicated route through which their rescuers entered, and he conceded that if something went awry, it could be disastrous.

“Diving is not easy. For people who have never done it, it will be difficult, unlike diving in a swimming pool, because the cave’s features have small channels,” he said. “If something happens midway, it could be life-threatening.”

Video released by the Thai navy showed the boys in their soccer uniforms sitting in a dry area inside the Tham Luang Nang Non cave above the water as a light held by a rescuer was shone on their faces.

Cave rescue experts have said it could be safer to simply supply them where they are for now, rather than trying to have the boys dive out.

That could take months, however, given that Thailand’s rainy season typically lasts through October.

SEAL commander Rear Adm. Arpakorn Yookongkaew said there was no rush to bring them out, since they’re safe where they are. A doctor and a nurse were with them in the cave.

“We have given the boys food, starting from easily digested and high-powered food with enough minerals,” Arpakorn said during a news conference.

Having them dive out of the cave was one of several options being considered, “but if we are using this plan, we have to be certain that it will work and have to have a drill to make sure that it’s 100 percent safe,” he said.

Authorities said efforts would continue outside the cave, where teams have been scouring the mountainside for other entrances to the caverns. Several fissures have been found and teams have explored some, although so far, none lead to the trapped boys.