As an global team of experts race against time to rescue the remaining four footballers and their coach trapped inside the labyrinthine cavern for more than two weeks, the dark place seems to shine with the light of hope and faith in humanity.
The former Thai navy Seal succumbed to lack of oxygen while delivering supplies.
"If you ask me if I'm sad, it's like I've died but I'm still alive".
"He's been praised as a hero because of who he was", she said.
The wife of Saman Kunan, the former Thai Navy SEAL member who died during a rescue operation to extract 13 people from the Tham Luang cave complex, has taken to social media to express her heartbreak over the loss of her husband. Every day before he left for work we said we loved each other.
Saman was part of a rescue team made up of divers from some 50 countries, including Australia.
In an emotional interview with BBC, his widow, Waleeporn Gunan said that she was proud of her husband and was using this pride to repress her sorrow.
The bowels of Tham Luang cave are described as being pitch-black with near-zero visibility.
"I want to tell you honey, you are the hero in my heart".
They say the four boys and coach rescued Tuesday, after other rescues in the previous two days, are all safe.
Thai cave rescue: How did the final rescue effort play out?
When news of his death broke, the Thai king said Saman would have a funeral with full honours.
His grieving father was also reported to be proud of his son's selfless deeds but was very sad to lose his beloved son.
Waleeporn revealed her heartbreak over her husband's death as he volunteered helping to save the soccer team.
"Saman once said we never knew when we would die".
"Today is D-day", Chiang Rai's Governor Narongsak Osotthanakorn declared earlier in the day.