In this July 3, 2018, image taken from video provided by the Royal Thai Navy Facebook Page, Thai boys smile as Thai Navy SEAL medic help injured children inside a cave in Mae Sai, northern Thailand.  The Thai soccer teammates stranded more than a week in the partly flooded cave said they were healthy on a video released Wednesday, as heavy rains forecast for later this week could complicate plans to safely extract them. (Royal Thai Navy Facebook Page via AP)
In this July 3, 2018, image taken from video provided by the Royal Thai Navy Facebook Page, Thai boys smile as Thai Navy SEAL medic help injured children inside a cave in Mae Sai, northern Thailand. The Thai soccer teammates stranded more than a week in the partly flooded cave said they were healthy on a video released Wednesday, as heavy rains forecast for later this week could complicate plans to safely extract them. (Royal Thai Navy Facebook Page via AP)
PHOTO: Royal Thai Navy Facebook Page via AP
Now playing
01:52
New video shows Thai boys in cave saying they're healthy
CHIANG RAI, THAILAND - JULY 18:  Twelve boys and their coach from the "Wild Boars" soccer team arrive for a press conference for the first time since they were rescued from a cave in northern Thailand last week, on July 18, 2018 in Chiang Rai, Thailand. The 12 boys, aged 11 to 16, and their 25-year-old coach were discharged early from Chiang Rai Prachanukroh hospital after a speedy recovery and thanked those involved in their rescue. (Photo by Linh Pham/Getty Images)
CHIANG RAI, THAILAND - JULY 18: Twelve boys and their coach from the "Wild Boars" soccer team arrive for a press conference for the first time since they were rescued from a cave in northern Thailand last week, on July 18, 2018 in Chiang Rai, Thailand. The 12 boys, aged 11 to 16, and their 25-year-old coach were discharged early from Chiang Rai Prachanukroh hospital after a speedy recovery and thanked those involved in their rescue. (Photo by Linh Pham/Getty Images)
PHOTO: Linh Pham/Getty Images
Now playing
02:05
Thai cave rescue: 'I told them, don't lose hope.'
Some of the boys who were trapped in a cave in Northern Thailand outside a hospital in Chiang Rai after being discharged.
Some of the boys who were trapped in a cave in Northern Thailand outside a hospital in Chiang Rai after being discharged.
PHOTO: Rebecca Wright/CNN
Now playing
00:58
See moment Thai boys get released from hospital
PHOTO: Thai Navy Seals
Now playing
01:26
Video shows Thai boys' rescue from cave
mckenzie inside thai cave
mckenzie inside thai cave
PHOTO: CNN
Now playing
01:28
CNN reporter goes inside Thai cave
Vern Unsworth, British cave diver
Vern Unsworth, British cave diver
PHOTO: Rebecca Wright/CNN
Now playing
02:49
Elon Musk sued over 'pedo' tweet
Thai boys rescue video
Thai boys rescue video
PHOTO: Thai Navy Seals
Now playing
01:37
See first video of Thai boys' rescue from cave
PHOTO: Thai Royal Navy
Now playing
01:33
12 boys and their coach all out of Thai cave
Adisak Wongsukchan, father of rescued Wild Boars soccer player Akarat Wongsukchan.
Adisak Wongsukchan, father of rescued Wild Boars soccer player Akarat Wongsukchan.
PHOTO: Steve George/CNN
Now playing
00:57
Father of rescued boy: I want to hug him
PHOTO: CNN
Now playing
01:26
CNN reporter speechless by rescue news
PHOTO: Big Kren Media
Now playing
01:16
New video from dramatic cave rescue
Now playing
01:19
Aunt of trapped coach speaks about his life
PHOTO: Facebook/Akkapol Chanthawong
Now playing
01:36
How the Thai cave saga unfolded
virtual cave foreman
virtual cave foreman
PHOTO: CNN
Now playing
01:31
A virtual look inside the cave rescue
PHOTO: Twitter/Elon Musk
Now playing
01:33
Watch: Musk tests small rescue pod
An ambulance leaves the Tham Luang cave area after divers evacuated some of the 12 boys and their coach trapped at the cave in Khun Nam Nang Non Forest Park in the Mae Sai district of Chiang Rai province on July 8, 2018. - Elite divers on July 8 began the extremely dangerous operation to extract 12 boys and their football coach who have been trapped in a flooded cave complex in northern Thailand for more than two weeks, as looming monsoon rains threatened the rescue effort. (Photo by LILLIAN SUWANRUMPHA / AFP) /         (Photo credit should read LILLIAN SUWANRUMPHA/AFP/Getty Images)
An ambulance leaves the Tham Luang cave area after divers evacuated some of the 12 boys and their coach trapped at the cave in Khun Nam Nang Non Forest Park in the Mae Sai district of Chiang Rai province on July 8, 2018. - Elite divers on July 8 began the extremely dangerous operation to extract 12 boys and their football coach who have been trapped in a flooded cave complex in northern Thailand for more than two weeks, as looming monsoon rains threatened the rescue effort. (Photo by LILLIAN SUWANRUMPHA / AFP) / (Photo credit should read LILLIAN SUWANRUMPHA/AFP/Getty Images)
PHOTO: LILLIAN SUWANRUMPHA/AFP/Getty Images
Now playing
01:32
Official: Need more oxygen to finish rescue
(CNN) —  

The teenage soccer team trapped in a cave system in northern Thailand spent another night almost a kilometer underground, after officials coordinating the rescue said they won’t attempt to move them before Thursday.

New video released by the Thai Navy SEALs Wednesday showed the boys wrapped in foil blankets for warmth, as they speak up one by one, introducing themselves and saying “I am healthy.” One said “thank you” to everyone who is waiting for their rescue.

Claus Rasmussen, who is part of the rescue team, said the boys have told divers they heard dogs barking, a rooster crowing and children playing. That information now has teams looking at whether there is a chimney or hole they can access instead of trying to get the boys out through the water.

At least one plan to bring the boys back to the surface include having the teammates, aged 11 to 16, and their 25-year-old coach, dive through the narrow flooded tunnels in full-face diving masks.

Navys SEALs stayed with the boys overnight and tended their minor wounds.
Navys SEALs stayed with the boys overnight and tended their minor wounds.
PHOTO: Thai Royal Navy

The plight of the boys and their coach has captured the world’s attention. Former Real Madrid and Brazil soccer legend Ronaldo spoke to CNN at an event in Russia about the soccer team.

“It’s terrible news and the world of football hopes that someone can find a way to take these kids out of there,” he said.

Austria and Leicester City star Christian Fuchs sent a video message of support Wednesday.

“We have very strong ties with the country of Thailand, I’m closely following the rescue efforts to secure the lives of the 12 players and their coach,” said Fuchs. “I wish everybody all the best with their rescue efforts and I’m sure everything will be turning out well. Be strong.”

Fuchs won the Premier League title with Thai-owned Leicester in 2016.

“Hi, I’m Christian Fuchs from English Premier League team, Leicester City Football Club. We have very strong ties with the country of Thailand, I’m closely following the rescue efforts to secure the lives of the 12-players and their coach. I wish everybody all the best with their rescue efforts and I’m sure everything will be turning out well. Be strong.”

In a press conference Wednesday morning, Chiang Rai governor Narongsak Osottanakorn said it would be “difficult” to bring them out Wednesday. He said he didn’t want to give an estimate on when they could be brought out and be reunited with their families.

“All I can say is everyone is working very hard here. Everyone is working their hardest. They haven’t rested since day one,” he said.

To keep the boys’ spirits up, authorities are attempting to set up phone lines inside the cave to allow them to talk to their parents.

However, attempts to install the cables have been unsuccessful so far, Maj. Gen. Bancha Duriyaphan said. One cable suffered water damage as divers transported it “around small passages.” Teams are attempting to take in a new one.

“When the telephone line is ready, we will have relatives talk to them. The pressure will be immensely reduced,” Maj. Gen. Chalongchai Chaiyakum, another military spokesman, said.

Ticking clock

It’s now been over 48 hours since the boys were first located by two British divers, and while SEAL divers have been able to reach them with food and medicine, conditions mean it’s currently too risky to bring them out the same way the divers came in.

It’s is a long, hazardous dive, even for the experienced Navy SEAL divers.

Why will it take so long to rescue the trapped Thai soccer team?

Eight members of the navy team, as well as a doctor and nurse, are staying with the kids and their coach in the cave overnight, the Thai Royal Navy said in a Facebook post early Thursday. The insignia of the SEALs has been etched onto a rock face in the cave, video from the group’s Facebook page shows.

The insignia of the Thai Navy SEALs, etched onto a rock in the cavern the boys are trapped in.
The insignia of the Thai Navy SEALs, etched onto a rock in the cavern the boys are trapped in.
PHOTO: Royal Thai Navy/Facebook

Initial medical check-ups showed the boys to be in good health. Video showed some being treated for scrapes and mild rashes.

The doctor, Lt. Col. Park Loharachun, hasn’t left the boys’ side since diving into the cavern.

The divers are making the complicated dive back and forth to the small, cramped shelf where the boys have sheltered within the flooded cave complex. The group has been given high-protein gels to rebuild their strength.

After the initial contact with the British divers – two volunteer specialists who flew in to help with the search – the SEAL team returned to give the boys a meal of grilled pork and sticky rice, along with milk.

Thai rescuers are getting high-energy gel packs to the boys to help them regain their strength.
Thai rescuers are getting high-energy gel packs to the boys to help them regain their strength.
PHOTO: CNN

The focus now is on getting the teammates ready for the journey ahead. On Wednesday, the children – some of whom can’t swim – practiced wearing the full-face oxygen masks they’ll need to wear to survive the journey out.

They’ve tried using the equipment and breathing with it, but haven’t been submerged in the flood water, Osottanakorn said, as currents are too strong.

The plan is to bring them out at different times, depending on their strength.

“They don’t have to leave all at once. Those who are ready can come out first. We are reassessing the situation daily. We have to see they are ready. Therefore if we found any risk we won’t carry out the (evacuation) plan,” he added.

A sense of urgency persists with unpredictable weather and the threat of more rain that could further flood the chambers. The governor said water is still being pumped out of the cave “at full speed” to reduce water levels.

Days of relatively fine weather have given rescuers a window to prepare for the moment the boys eventually emerge from the cave. Soldiers dressed in green fatigues practiced evacuation drills, linking arms to form a human wall around the mouth of the cave.

Rescue workers link arms in a drill for what they
Rescue workers link arms in a drill for what they'll do once the boys come out.
PHOTO: CNN

Thailand cave rescue: The health toll of waiting for freedom

Difficult rescue

Debate remains over the best way to bring the boys to safety.

Given their weakness after a week with no food, trapped in the dark, and their unfamiliarity with scuba systems, some experts say it’s too difficult to bring a group of novices through a cave system that has made even caving experts nervous.

Cade Courtley, a former US Navy SEAL and author of the “SEAL Survival Guide” told CNN that he “was part of a very special dive unit and this would be a challenging dive for me and my team… now you’re going to ask 11 to 15-year-olds – some of whom cannot swim – to make that same journey for the first time breathing air underwater?”

The rescue in Thailand is “one of the toughest I’ve seen,” Anmar Mirza, national coordinator of the National Cave Rescue Commission and a rescue diver with 30 years’ experience, told CNN.

The most dangerous option, he said, “is trying to teach them enough diving skills to dive them out. It’s physically strenuous: in water, through blackout conditions, through tight squeezes for hundreds of meters.”

“It’s something that skilled cave divers spend hundreds of hours training for after they have already been open water divers for quite some time,” he told CNN. “A moment of panic or loss of the breathing regulator can be fatal for the novice diver, and may also put the cave diver escorting him in danger.”