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How radios are helping Thailand cave rescue

The technology behind the handheld radios created by Maxtech Networks is what has allowed rescuers to communicate during their mission to rescue the soccer team trapped in a cave in northern Thailand. CNN's Oren Liebermann reports.

Posted: Jul. 5, 2018 2:11 PM
Updated: Jul. 5, 2018 2:30 PM

Divers working to free 12 boys and their coach who are trapped in a cave in northern Thailand must navigate dark, flooded tunnels for six hours to reach them. It takes another five hours to return.

Details of the extraordinary operation underway at the Tham Luang Nang Non emerged Thursday, as rescuers pushed ahead with multiple plans to free the boys trapped underground for almost two weeks.

More rain is forecast this weekend, putting pressure on rescuers to formulate a plan to remove the boys before flood waters rise any higher.

Huge volumes of water are being pumped out of the cave complex each day, but the narrow, winding passages inside the cave are still flooded, meaning diving through the murky water is currently the only way in and out.

Around the camp which has sprung up near the cave entrance, Thai military divers have set up an encampment with diving gear and equipment, while people from the local community hand out food to rescuers, other volunteers and the small army of press on site.

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Trying to stop the water

Despite spending almost two weeks underground, Chiang Rai governor Narongsak Osottanakorn said Thursday the boys were in good spirits.

"I confirm here again that they are in good health and they are smiling and playing around," he said.

The last images the world saw of the boys was on Wednesday in a video where they introduced themselves one-by-one, saying "I am healthy."

Since they were found late Monday local time by a duo of British expert cave divers, Thai Navy SEALs have stayed with the team, tending minor wounds and giving them food to build up their strength.

The boys remain weak after spending days in the darkness, barely moving from the small, muddy ledge, away from the water.

While rescuers are trying to pump enough water out of the cave to allow the boys to simply walk out, Thai Navy SEALs are also teaching them how to scuba dive.

The boys would need to wear full-face diving masks to enter the narrow tunnels in moving water, though many experts say this would be a dangerous option for novice divers.

In an attempt to maintain the boys' morale, rescue teams have prioritized installing a line of communication between the boys and their parents.

However, they were still attempting to connect them Thursday after earlier efforts failed when the line became damaged after falling into water. On Thursday, CNN saw an old-style military phone and loops of cable being carried into the cave by engineers.

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Search for other entrances continues

As divers work in tunnels deep below ground, teams are also scouring the hillside above the caves, looking for possible entry points to the chamber where the boys are sheltering.

"We are drawing our jungle trekking resources together. There are about 20 to 30 teams," Osottanakorn said.

"Now we are going to walk around that area to search every inch, (to see if) there are chimneys or holes where we can climb down, and we may adjust our plan."

The teams searching for another route through a natural chimney were dispatched following reports that the boys had told divers they heard dogs barking, a rooster crowing and children playing, possibly indicating a shaft leading up to the surface.

"There has been reports that kids have heard sounds from chickens and birds," Ben Reymenants, a Belgian who owns a diving shop in Thailand and has been assisting with the rescue efforts, told CNN.

"Were those hallucinations or did they really hear it? Because that would mean there is livestock nearby or at least a forest which would make an alternative entrance possible."

Osottanakorn said that teams on the surface were no longer drilling into the rock to create new shafts, but are focusing efforts on finding existing chimneys.

"We are no longer digging -- we will find a way that can give us access (without digging) direct to the area where the boys are," he said.

Rains a constant concern

Rescue coordinators are warily eying the skies for further downpours, which could imperil the rescue mission.

"In the previous days we were fighting with time. And now we are working against water," Osottanakorn said.

"We are draining out as much as our capacity allows. But water continues to flow in, no matter how many holes have been blocked, water still continues to pour in."

Osottanakorn said rescuers were at the mercy of the rainy season, and may have to act quickly to beat fresh downpours.

"If we must evacuate (the boys) out before they are ready due to the rain ... we will do so, but it will be the very last resort to do so," he said.

Rescuers have prepared 13 sets of equipment for the team, but Osottanakorn would not confirm if rescue would happen Thursday.

CNN Weather reports that while rain can't be ruled out, there is a likelihood that the area will remain relatively dry until at least Saturday.

The chance of rainfall increases from Sunday, and alongside the increased rainfall is the threat of heavier downpours.

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International efforts

Thai Navy divers have brought in substantial supplies -- including food and water for at least two weeks along with aluminum blankets, with support from Australian and other international divers, according to a statement from the Australian Federal Police (AFP).

The AFP's Specialist Response Group (SRG) personnel are among the many divers and support staff who have been sent by a number of nations.

The Australians on the ground "remain closely engaged in efforts to support and sustain the group, as well as in planning. This includes supporting the Royal Thai Navy to transport food, water and first aid supplies into the cave system through to the group."

They are also cooperating with Thai Navy colleagues and the wider international dive teams to stock dive tanks and other equipment throughout the route to aid the eventual evacuation of the isolated cavern.

They are part of an international contingent that includes teams from the US military, the UK, and China.

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