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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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
Thailand cave rescue BCC News Live Report  June 5 2018
Thailand cave rescue BCC News Live Report June 5 2018
Tham Luang Cave Rescue: Against the Elements | Full episode
Tham Luang Cave Rescue: Against the Elements | Full episode
Back Alleys of Saigon
Back Alleys of Saigon
Vietnam Market Hunt
Vietnam Market Hunt
Thailand Cave: How the Thai cave boys were rescued - BBC News
Thailand Cave: How the Thai cave boys were rescued - BBC News
What We Didn't See From The Thailand Cave Rescue | Studio 10
What We Didn't See From The Thailand Cave Rescue | Studio 10
Man Turns Old Airplane Into His Dream Home And The Shower Is Amazing
Man Turns Old Airplane Into His Dream Home And The Shower Is Amazing
Thai cave rescue: Highlights from the Wild Boars' first public appearance
Thai cave rescue: Highlights from the Wild Boars' first public appearance
Thailand cave rescue: Children found ‘by smell’ - BBC News
Thailand cave rescue: Children found ‘by smell’ - BBC News
Rescuers Continue Weighing Safest Options To Save Trapped Soccer Team | TODAY
Rescuers Continue Weighing Safest Options To Save Trapped Soccer Team | TODAY
Thai cave rescue: Interview with Wild Boars and coach Ek
Thai cave rescue: Interview with Wild Boars and coach Ek
Massive effort to rescue stranded youth soccer team
Massive effort to rescue stranded youth soccer team
Rescuers rush to help boys stranded in cave before monsoon hits
Rescuers rush to help boys stranded in cave before monsoon hits
Thai cave rescue diver: 'I feel very relieved today'
Thai cave rescue diver: 'I feel very relieved today'
Thailand cave rescue: how to get them out?
Thailand cave rescue: how to get them out?
Thailand cave rescue: New Footage released - BBC News
Thailand cave rescue: New Footage released - BBC News
Thai cave rescue: How to get 12 Thai boys and their coach out of Tham Luang cave safely?
Thai cave rescue: How to get 12 Thai boys and their coach out of Tham Luang cave safely?
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
Thai cave rescue: Canadian member of rescue team recounts mission to save boys and coach
Thai cave rescue: Canadian member of rescue team recounts mission to save boys and coach
How did soccer players survive in Thai cave?
How did soccer players survive in Thai cave?
Thailand Cave Rescue: What’s next?  - BBC Newsnight
Thailand Cave Rescue: What’s next? - BBC Newsnight
Ellen Talks to Thai Soccer Team in Their First In-Studio Interview Since Cave Rescue
Ellen Talks to Thai Soccer Team in Their First In-Studio Interview Since Cave Rescue
Daunting task ahead for divers to free boys from Thai cave | ITV News
Daunting task ahead for divers to free boys from Thai cave | ITV News
Rescue Teams Race Against Monsoons To Save Thai Soccer Team | Velshi & Ruhle | MSNBC
Rescue Teams Race Against Monsoons To Save Thai Soccer Team | Velshi & Ruhle | MSNBC
Thai cave rescue: What it's like inside a cave complex in Chiang Rai - BBC News
Thai cave rescue: What it's like inside a cave complex in Chiang Rai - BBC News
Rescued boys, coach say they never gave up hope of being found in Thailand cave
Rescued boys, coach say they never gave up hope of being found in Thailand cave
Thailand cave rescue: Boys tell the story of their ‘miracle’ survival
Thailand cave rescue: Boys tell the story of their ‘miracle’ survival
Father of youngest Thai cave survivor describes how team became trapped
Father of youngest Thai cave survivor describes how team became trapped
Diving expert explains challenges of Thailand cave rescue
Diving expert explains challenges of Thailand cave rescue
Thai cave rescue: Australian divers who helped free Thai soccer team receive bravery awards
Thai cave rescue: Australian divers who helped free Thai soccer team receive bravery awards
🇹🇭 '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
Virtual look at the caves trapping boys
Virtual look at the caves trapping boys
One Thai soccer player who narrowly escaped | DW English
One Thai soccer player who narrowly escaped | DW English
Boys' soccer team and coach found alive in Thailand cave
Boys' soccer team and coach found alive in Thailand cave
Thai cave rescue: Singapore diver Douglas Yeo shares his experience
Thai cave rescue: Singapore diver Douglas Yeo shares his experience
Thai cave rescue's biggest obstacle is the environment
Thai cave rescue's biggest obstacle is the environment
Chilean Mine Rescue Timeline
Chilean Mine Rescue Timeline
Thailand cave rescue: Meet the volunteer helpers - BBC News
Thailand cave rescue: Meet the volunteer helpers - BBC News
The Coming Floods, Full Report. Plz Share!
The Coming Floods, Full Report. Plz Share!
Thai Cave Rescue: What’s next?  - BBC News
Thai Cave Rescue: What’s next? - BBC News
Inside Thai cave with rescue divers
Inside Thai cave with rescue divers
scuba, cave diving ''The Big Black''   The last dive of David Shaw 21 43, XviD format
scuba, cave diving ''The Big Black'' The last dive of David Shaw 21 43, XviD format
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
12 boys, soccer coach rescued from cave in Thailand
12 boys, soccer coach rescued from cave in Thailand
Boys, coach found alive after 9 days in Thai cave
Boys, coach found alive after 9 days in Thai cave
Thailand cave rescue has successful first phase
Thailand cave rescue has successful first phase
12 Teens and Football Coach Trapped in Thai cave
12 Teens and Football Coach Trapped in Thai cave
Thai cave rescue: Captain Jessica Tait of the Indo-Pacific Command
Thai cave rescue: Captain Jessica Tait of the Indo-Pacific Command
⚽Young Thai Football Team Found w/ Translations | TIMyT 45
⚽Young Thai Football Team Found w/ Translations | TIMyT 45