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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Tham Luang Cave Rescue: Against the Elements | Full episode
Tham Luang Cave Rescue: Against the Elements | Full episode
Thailand Cave: How the Thai cave boys were rescued - BBC News
Thailand Cave: How the Thai cave boys were rescued - BBC News
Chilean Mine Rescue Timeline
Chilean Mine Rescue Timeline
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
What We Didn't See From The Thailand Cave Rescue | Studio 10
What We Didn't See From The Thailand Cave Rescue | Studio 10
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
Official reveals last-minute dangers of Thai cave rescue
Official reveals last-minute dangers of Thai cave rescue
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
Top 20 Incredible Bridges You Have To See To Believe
Top 20 Incredible Bridges You Have To See To Believe
7 Reasons Not to Move to Thailand
7 Reasons Not to Move to Thailand
Divers reveal extraordinary behind-the-scenes details of Thailand cave rescue
Divers reveal extraordinary behind-the-scenes details of Thailand cave rescue
Thailand cave rescue: how to get them out?
Thailand cave rescue: how to get them out?
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?
NHK Documentary - Underwater Universe of the Orda Cave [1080p]
NHK Documentary - Underwater Universe of the Orda Cave [1080p]
Thailand cave rescue: Children found ‘by smell’ - BBC News
Thailand cave rescue: Children found ‘by smell’ - BBC News
Tham Luang Cave Rescue: The Wild Boar Football Club | Talking Point | CNA Insider
Tham Luang Cave Rescue: The Wild Boar Football Club | Talking Point | CNA Insider
Thailand cave rescue: New Footage released - BBC News
Thailand cave rescue: New Footage released - BBC News
Thai cave rescue's biggest obstacle is the environment
Thai cave rescue's biggest obstacle is the environment
1000 Abandoned Cars Found in Cave Mysteriously - Caverns Of Lost Souls
1000 Abandoned Cars Found in Cave Mysteriously - Caverns Of Lost Souls
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
How Did the Tham Luang Cave Turn Into a Death Trap? - Operation Thai Cave Rescue [3/7]
How Did the Tham Luang Cave Turn Into a Death Trap? - Operation Thai Cave Rescue [3/7]
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
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 press conference: British divers explain how they helped save boys
Thai cave rescue press conference: British divers explain how they helped save boys
Inside Thai cave with rescue divers
Inside Thai cave with rescue divers
Thailand cave rescue has successful first phase
Thailand cave rescue has successful first phase
Thailand Cave Rescue: What’s next?  - BBC Newsnight
Thailand Cave Rescue: What’s next? - BBC Newsnight
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
Thailand cave rescue: Meet the volunteer helpers - BBC News
Thailand cave rescue: Meet the volunteer helpers - BBC News
Thai cave rescue. Full story in 2D animation, including behind the scenes.
Thai cave rescue. Full story in 2D animation, including behind the scenes.
Thai cave rescue: Challenges divers face in operation
Thai cave rescue: Challenges divers face in operation
12 Teens and Football Coach Trapped in Thai cave
12 Teens and Football Coach Trapped in Thai cave
Diving expert explains challenges of Thailand cave rescue
Diving expert explains challenges of Thailand cave rescue
Details of Thailand cave rescue - animation
Details of Thailand cave rescue - animation
11-year-old Thai soccer player held onto coach's back during rescue
11-year-old Thai soccer player held onto coach's back during rescue
Boys, coach found alive after 9 days in Thai cave
Boys, coach found alive after 9 days in Thai cave
Timeline of how the Thai cave rescue went down - TomoNews
Timeline of how the Thai cave rescue went down - TomoNews
How did soccer players survive in Thai cave?
How did soccer players survive in Thai cave?
Boys' soccer team and coach found alive in Thailand cave
Boys' soccer team and coach found alive in Thailand cave
Thai cave rescue:  First boys rescued - BBC News
Thai cave rescue: First boys rescued - BBC News
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
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
Thailand cave rescue: Boys tell the story of their ‘miracle’ survival
Thailand cave rescue: Boys tell the story of their ‘miracle’ survival
Getting Stuck in 'The Tube'  -  Lost Johns Cave
Getting Stuck in 'The Tube' - Lost Johns Cave
Rescuers rush to help boys stranded in cave before monsoon hits
Rescuers rush to help boys stranded in cave before monsoon hits
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
Thailand cave rescue BCC News Live Report  June 5 2018
Thailand cave rescue BCC News Live Report June 5 2018
Thai cave rescue: British diver lost rope guide for four minutes during mission - 5 News
Thai cave rescue: British diver lost rope guide for four minutes during mission - 5 News
Official: Dive team has entered Thai cave
Official: Dive team has entered Thai cave