AUTHORITIES are racing to drain water from a flooded cave in Thailand as part of a desperate attempt to save 12 trapped schoolboys and their football coach.

The world watches with bated breath while the boys — who have been stranded for almost two weeks now — are reportedly being trained in how to breathe with scuba equipment as they prepare for a possible attempt at leaving the cave this morning.

Timing is crucial in the complex operation as heavy storms are soon forecast to arrive, which could make it impossible to evacuate the group for months.

A 24/7 draining operation is now in place, but Thai authorities are still understood to be weighing up the best method of extracting the boys. The best option would be to rid the cave almost entirely of water, which would allow the stranded group to crawl 4km to safety, but they would still need to pass through short underwater passages.

However, because of the looming monsoon rains forecast to hit the area later this week, Thai authorities believe teaching the boys to dive so they can be escorted out of the system by rescue divers, is the most realistic option.

A cave explorer assisting Thai authorities trying to rescue the schoolboys believes “we’ll know in the next 24 hours” if they will survive.

British cave expert Vern Unsworth, who lives in Thailand, said the conditions were getting worse and there was now a narrow window in which the group could escape.

“I think we’ll know in the next 24 hours … We’ll keep our fingers crossed, everybody needs to pray and hope for a good outcome,” Mr Unsworth told the BBC.

The boys aged between 11 and 16, along with their football coach, have been trapped in the flooded Tham Luang cave system for 12 days.

But heavy monsoon rain is coming, and Mr Unsworth said rain that had already fallen had caused a dramatic rise in water levels in the cave.

“The main thing is to try to get the children to safety. We have to keep hoping. The water levels are rising, we had a lot of rain overnight.”

He said the temperature of the water was cold, although the air temperature wasn’t an issue.

The challenge ahead of the group is enormous — they cannot swim and are not divers. They have also been weak after spending days without food, but are gaining in strength after being given high-protein drinks.

Authorities insist they won’t begin the rescue mission that has gripped the whole world until it was safe to do so. It will be dawn there at about 8.30am AEST.

“We have to be 100 per cent confident that there is no risk to the boys before we evacuate,” Narongsak Osottanakorn, Chiang Rai provincial governor, told reporters.

“We will take care of them like they are our own children,” he said. The group are being taught how to use diving masks and breathing apparatus, he added, but from the safety of the muddy bank which for now remains their sanctuary.

Doctors and nurses are making their way from the staging area up towards the mouth of the cave where 12 boys and their soccer coach remain trapped @9NewsSyd pic.twitter.com/gkKN1qE6MU — Alice Monfries (@alicemonfries) July 4, 2018

Getting out of the cave won’t be easy. It will require diving of about a kilometre which could not be completed all at once. In total, it was expected to take three hours.

Another British expert, Gary Mitchell, described the challenging conditions. “There’s air pockets along the way,” he told the Associated Press.

“It’s confined spaces. It’s almost zero visibility. There’s currents to battle against in places as well. So it’s really quite a strenuous environment to be in.”

Doctors and nurses were seen moving up to the entrance of the flooded cave last night, fuelling speculation that an attempt was imminent.

Medical staff were filmed leaving the staging area further down the slope and were on the move to the mouth of the cave as reports emerged the rescue mission could begin as soon as this morning.

DIVE LESSONS

Classmates and friends of the schoolboys also reportedly were near the cave’s entrance singing songs of support.

After a day of sustained pumping efforts, water levels inside the massive cave complex have been reduced and fierce currents have eased, The Australian reports.

However, that was before rain lashed the area yesterday afternoon.

The newspaper reports it has been told that fast-water currents inside the cave have eased to a standstill and with monsoonal rains expected to resume by Friday, conditions for the rescue are as good as they are likely to get.

Royal Thai Navy SEALs have been teaching the boys and their coach — none of whom can swim — how to breathe in a full face scuba mask.

Chiang Rai provincial governor Narongsak Osatanakorn said also warned not all of the 12 schoolboys and their coach may be able to come out of the cave at the same time.

“If the condition is right and if that person is ready 100 per cent, he can come out,” he said.

Thai authorities have been working with Navy SEALs to run a fibre optic internet line into the flooded cave so that phone calls can be made in and out.

NEW VIDEO OF LAUGHING BOYS

Despite the imminent danger, the children have appeared in a new video, laughing as they greet the camera to say they are in good health.

The footage, published on the Thai Navy SEAL Facebook page, runs by 11 of the 13 members of the team, each makes a traditional Thai greeting gesture to the camera before introducing themselves by nickname and saying “I’m in good health”.

Some appeared to be wearing a change of clothes since they were found late Monday and most were wrapped in foil warming blankets.

The reason the boys entered the cave, according to a Dutch diver working in Thailand, was to write their names on the wall as part of an initiation ritual.

Sky News reported that Dutch diver Ben Reymenants, who runs a diving school in Phuket, had made contact with the boys.

He said when the boys ventured into the Tham Luang Nang Non cave complex to write their names on the walls, a flash flood trapped them.

“They left their backpacks and their shoes before wading in there, trying to go to the end of the tunnel like an initiation for local young boys,” he said.

RESCUE OPTIONS

The Interior Minister Anupong Paojinda said evacuating the boys “must speed up” as soon as possible before more rain falls and exacerbates the flooding.

The grim forecast could force authorities to have the children — who cannot swim — out through a narrow, underwater passage in the cave.

“If something happens midway, it could be life-threatening.” Mr Paojinda said.

“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.”

There are a couple of other options on the table if that doesn’t work and the heavy rains subside.

Authorities are considering digging them out of the cave, but if this goes wrong it could cause the cavern where the team has taken refuge to cave in.

Rescuers could potentially drain the caves enough to allow the boys to wade or float out with life vests.

The final option is to leave them in there for three or four months until the rains subside.

Detective Superintendent Thomas Hester said the team of six divers from the Australian Federal Police faced “incredibly challenging” conditions.

Rescuers have asked for 15 small and extra small full face masks, leading to speculation that divers were preparing a rescue mission through the 750-metre flooded stretch of the Tham Luang Nang Non cave.

Media have been told it was too dangerous to use conventional breathing apparatus as it could easily be knocked out during the dive.

While efforts to pump out floodwaters are continuing, it’s clear that some areas of the sprawling cavern cannot be drained, said Mr 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.

Mr 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.

Yesterday, a 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 told 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 per cent safe,” he said.

Chiang Rai provincial Gov. Narongsak Osatanakorn said the health of the boys and coach were checked using a field assessment in which red is critical condition, yellow is serious and green is stable.

“We found that most of the boys are in green condition,” he said. “Maybe some of the boys have injuries or light injuries and would be categorised as yellow condition. But no one is in red condition.”

Relatives keeping vigil at the mouth of the cave since the ordeal began rejoiced at the news that their boys and their coach had been found.

“I want to give him a hug. I miss him very much,” said Tham Chanthawong, an aunt of the coach. “In these 10 days, how many million seconds have there been? I’ve missed him every second.”

MOMENT THE BOYS WERE FOUND ALIVE

Rick Stanton and John Volanthen, two expert cave divers from Britain, found the group about 300-400 metres past a section of the cave on higher ground that was believed to be where they might have taken shelter.

In the 5-minute navy video, the boys were seen wearing their soccer uniforms and were calm, curious and polite.

They also were keen to get some food. After an initial exchange in which a rescuer determines that all 13 are present, one of the boys asked what day it was, and a rescuer replied: “Monday. Monday. You have been here — 10 days.”

The rescuer told them “you are very strong.” The traditional reserve of Thai children toward adults broke slightly after a while, and one boy told another in Thai, “Tell them we are hungry.”

“We haven’t eaten,” a boy said in Thai, then in English: “We have to eat, eat, eat!” A rescuer assured them that “Navy SEALs will come tomorrow, with food and doctors and everything.” At the end of the video, a boy asked in English, “Where do you come from?”

The rescue diver replied, “England, UK.” Besides the protein drink, Narongsak said they were given painkillers and antibiotics, which doctors had advised as a precaution.

He said officials had met and agreed on the need to “ensure 100 per cent safety for the boys when we bring them out.”

“We worked so hard to find them and we will not lose them,” he said. Cave diver Ben Reymenants, part of the team assisting the rescue effort, told NBC’s Today show that he was “very surprised obviously that they are all alive and actually mentally also healthy.” While they appear responsive, “they are very weak and very skinny,” he added.

Reymenants said the easiest option would be to “keep pumping the water out of the cave. They need another 3 or 4 feet so they can literally float them out with life jackets.”

“But time is not on their side,” he noted, because of the heavy rain forecast. He added that two Thai navy doctors have volunteered to stay with them for months, if needed.

The British Cave Rescue Council, which has members taking part in the operation, said in a statement that “although water levels have dropped, the diving conditions remain difficult and any attempt to dive the boys and their coach out will not be taken lightly because there are significant technical challenges and risks to consider.”

Joining the British are other experts from around the world and teams from the U.S., Australia, China and elsewhere.

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.

— with wires