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
Thai cave rescue. Full story in 2D animation, including behind the scenes.
Thai cave rescue. Full story in 2D animation, including behind the scenes.
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
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
Divers reveal extraordinary behind-the-scenes details of Thailand cave rescue | Four Corners
Divers reveal extraordinary behind-the-scenes details of Thailand cave rescue | Four Corners
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
Boys' soccer team and coach found alive in Thailand cave
Boys' soccer team and coach found alive in Thailand cave
Thai cave rescue: Why it took 17 days to free the trapped boys | Did You Know?
Thai cave rescue: Why it took 17 days to free the trapped boys | Did You Know?
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
Thailand cave rescue has successful first phase
Thailand cave rescue has successful first phase
How did soccer players survive in Thai cave?
How did soccer players survive in Thai cave?
John Volanthen interviewed on BBC Points West - 13th July 2018
John Volanthen interviewed on BBC Points West - 13th July 2018
Thailand cave rescue: how to get them out?
Thailand cave rescue: how to get them out?
Risks hamper Thailand cave rescue
Risks hamper Thailand cave rescue
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
Virtual look at the caves trapping boys
Virtual look at the caves trapping boys
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?
Official reveals last-minute dangers of Thai cave rescue
Official reveals last-minute dangers of Thai cave rescue
Rescuers rush to help boys stranded in cave before monsoon hits
Rescuers rush to help boys stranded in cave before monsoon hits
Details of Thailand cave rescue - animation
Details of Thailand cave rescue - animation
Getting Stuck in 'The Tube'  -  Lost Johns Cave
Getting Stuck in 'The Tube' - Lost Johns Cave
Father of youngest Thai cave survivor describes how team became trapped
Father of youngest Thai cave survivor describes how team became trapped
Experienced divers explain the attempted rescue of the trapped Thai soccer team
Experienced divers explain the attempted rescue of the trapped Thai soccer team
Thailand cave rescue BCC News Live Report  June 5 2018
Thailand cave rescue BCC News Live Report June 5 2018
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]
Thailand cave rescue: Children found ‘by smell’ - BBC News
Thailand cave rescue: Children found ‘by smell’ - BBC News
Diving expert explains challenges of Thailand cave rescue
Diving expert explains challenges of Thailand cave rescue
Thailand cave rescue: Meet the volunteer helpers - BBC News
Thailand cave rescue: Meet the volunteer helpers - BBC News
How the Thai cave rescue unfolded
How the Thai cave rescue unfolded
Thai cave rescue: Highlights from the Wild Boars' first public appearance
Thai cave rescue: Highlights from the Wild Boars' first public appearance
John Jones - Caver Dies While Exploring Cave with Family in Utah
John Jones - Caver Dies While Exploring Cave with Family in Utah
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
Thai cave rescue diver: 'I feel very relieved today'
Thai cave rescue diver: 'I feel very relieved today'
12 Teens and Football Coach Trapped in Thai cave
12 Teens and Football Coach Trapped in Thai cave
Four more boys pulled from flooded cave in Thailand
Four more boys pulled from flooded cave in Thailand
Inside Thai cave with rescue divers
Inside Thai cave with rescue divers
Thai cave rescue: Captain Jessica Tait of the Indo-Pacific Command
Thai cave rescue: Captain Jessica Tait of the Indo-Pacific Command
Thailand cave rescue: Boys tell the story of their ‘miracle’ survival
Thailand cave rescue: Boys tell the story of their ‘miracle’ survival
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
Former Thai Navy Seal Given Military Honors After Dying During Cave Rescue
Former Thai Navy Seal Given Military Honors After Dying During Cave Rescue
Will Thai cave rescue operation taste success? - TV9
Will Thai cave rescue operation taste success? - TV9
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
Diving or pumping water are possible solutions for Thai Cave Rescue
Diving or pumping water are possible solutions for Thai Cave Rescue
Why Did the Thai Cave Rescue Keep Us Hooked? | NBC Left Field
Why Did the Thai Cave Rescue Keep Us Hooked? | NBC Left Field
Lakeland man with cave expertise watching Thailand rescue effort
Lakeland man with cave expertise watching Thailand rescue effort
'I am dying to see him': relatives wait anxiously for rescue of Thai boys from cave
'I am dying to see him': relatives wait anxiously for rescue of Thai boys from cave
Thailand cave rescue latest: mission ready to go
Thailand cave rescue latest: mission ready to go
Thailand cave rescue now a ‘race against the rain’
Thailand cave rescue now a ‘race against the rain’
Thailand Cave rescue: 12 boys and their coach are out - BBC News
Thailand Cave rescue: 12 boys and their coach are out - BBC News