Here are the obstacles facing rescuers trying to extract the 12 boys and their football coach from Tham Luang cave in Chiang Rai. Channel NewsAsia's Glenda Chong looks at their options.

Meet the Wild Boars and the heroes who helped bring them to safety: https://cna.asia/thaicaverescueheroes

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Thailand Cave: How the Thai cave boys were rescued - BBC News
Thailand Cave: How the Thai cave boys were rescued - BBC News
Gambaran Medan Penyelamatan Tim Sepakbola dari Gua Tham Luang Thailand
Gambaran Medan Penyelamatan Tim Sepakbola dari Gua Tham Luang Thailand
Así es Tham Luang, la cueva de Tailandia en la que 12 niños están atrapados
Así es Tham Luang, la cueva de Tailandia en la que 12 niños están atrapados
Missing soccer team found alive in a cave in Thailand after 10 days
Missing soccer team found alive in a cave in Thailand after 10 days
Rescue mission: Footage emerges from depths of flooded Thai cave - Daily Mail
Rescue mission: Footage emerges from depths of flooded Thai cave - Daily Mail
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13 Orang yang Terjebak di Gua Berhasil Dievakuasi
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தாய்லாந்தில் குகையில் சிக்கியுள்ள 13 பேரில் 8 பேர் மீட்பு! | Thailand Cave Rescue!
Aksi Heroik Tim Penyelam Selamatkan Korban di Gua Tham Luang
Aksi Heroik Tim Penyelam Selamatkan Korban di Gua Tham Luang
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คลิปเต็มไม่ตัด+ซับไทย นาที 13 ชีวิตทีมหมูป่ารอดตาย พูดภาษาอังกฤษตอบโต้นักดำน้ำต่างชาติ
Watch: A Breakdown Of Rescue Team's Plan To Evacuate Thai Boys From Cave
Watch: A Breakdown Of Rescue Team's Plan To Evacuate Thai Boys From Cave
Official reveals last-minute dangers of Thai cave rescue
Official reveals last-minute dangers of Thai cave rescue
Meet The Elite Diving Duo At The Heart Of The Thailand Soccer Team Rescue | TODAY
Meet The Elite Diving Duo At The Heart Of The Thailand Soccer Team Rescue | TODAY
ఆ పిల్లలను రక్షించే మార్గాలివే | Thai Rescue operation ongoing to save football team trapped in cave
ఆ పిల్లలను రక్షించే మార్గాలివే | Thai Rescue operation ongoing to save football team trapped in cave
Thailand cave rescue: how to get them out?
Thailand cave rescue: how to get them out?
How did soccer players survive in Thai cave?
How did soccer players survive in Thai cave?
Keratan bentuk muka bumi di Gua Tham Luang, Thailand
Keratan bentuk muka bumi di Gua Tham Luang, Thailand
Diving expert explains challenges of Thailand cave rescue
Diving expert explains challenges of Thailand cave rescue
Thai cave rescue: Interview with Wild Boars and coach Ek
Thai cave rescue: Interview with Wild Boars and coach Ek
Virtual look at the caves trapping boys
Virtual look at the caves trapping boys
തായ്‌‌ലൻറിലേത് ലോകോത്തര രക്ഷാപ്രവർത്തനം | Thailand
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🇹🇭 'Race against water' as rain threatens Thai cave rescue efforts | Al Jazeera English
🇹🇭 'Race against water' as rain threatens Thai cave rescue efforts | Al Jazeera English
Thailand Cave Rescue: What’s next?  - BBC Newsnight
Thailand Cave Rescue: What’s next? - BBC Newsnight
A Denver-Based Company Helps With Cave Rescue
A Denver-Based Company Helps With Cave Rescue
Thailand cave rescue: New Footage released - BBC News
Thailand cave rescue: New Footage released - BBC News
The British Divers at the Centre of the Thai Cave Rescue | This Morning
The British Divers at the Centre of the Thai Cave Rescue | This Morning
'I felt nervous and worried': 12 boys, coach trapped inside Thai cave:  20/20 Part 1
'I felt nervous and worried': 12 boys, coach trapped inside Thai cave: 20/20 Part 1
Thailand cave rescue now a ‘race against the rain’
Thailand cave rescue now a ‘race against the rain’
4 Trapped Children Rescued From Thailand Cave | Breaking News
4 Trapped Children Rescued From Thailand Cave | Breaking News
Thailand Cave Rescue | Tamil | Madan Gowri | MG
Thailand Cave Rescue | Tamil | Madan Gowri | MG
Rescuers rush to help boys stranded in cave before monsoon hits
Rescuers rush to help boys stranded in cave before monsoon hits
Inside Thai cave with rescue divers
Inside Thai cave with rescue divers
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Thai cave rescue: Challenges divers face in operation
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Thai cave rescue's biggest obstacle is the environment
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Thai cave rescue: How to get 12 Thai boys and their coach out of Tham Luang cave safely?
Thailand plans to turn Tham Luang cave into tourist attraction
Thailand plans to turn Tham Luang cave into tourist attraction
Rescuers Continue Weighing Safest Options To Save Trapped Soccer Team | TODAY
Rescuers Continue Weighing Safest Options To Save Trapped Soccer Team | TODAY
Thailand cave rescue: Children found ‘by smell’ - BBC News
Thailand cave rescue: Children found ‘by smell’ - BBC News
Boys, coach found alive after 9 days in Thai cave
Boys, coach found alive after 9 days in Thai cave
Thai cave rescue:  First boys rescued - BBC News
Thai cave rescue: First boys rescued - BBC News
Thai cave rescue: 'No kid has cave dived like this before' - BBC News
Thai cave rescue: 'No kid has cave dived like this before' - BBC News
Community rallies behind Thai soccer coach after rescue
Community rallies behind Thai soccer coach after rescue
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What We Didn't See From The Thailand Cave Rescue | Studio 10
Thailand cave rescue: Escape may require boys learning to dive
Thailand cave rescue: Escape may require boys learning to dive
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Pandangan Anda Akan Berubah Setelah Lihat ini! 10 HAL ANEH YG DILAKUKAN ORANG DUBAI PART III
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Best Extreme Caving Video Moments 2017 with Dudley Caving Club
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Tham Luang Cave Rescue: The Wild Boar Football Club | Talking Point | CNA Insider
Water pumped from Thai cave as bid to rescue trapped boys intensifies | ITV News
Water pumped from Thai cave as bid to rescue trapped boys intensifies | ITV News
Thai cave rescue: Former Navy diver dies while exiting flooded tunnels
Thai cave rescue: Former Navy diver dies while exiting flooded tunnels
Official: Dive team has entered Thai cave
Official: Dive team has entered Thai cave