Dan
Contributor
This video taken yesterday didn’t indicate kids that were breathing 15% oxygen to me 

Welcome to ScubaBoard, the world's largest scuba diving community. Registration is not required to read the forums, but we encourage you to join. Joining has its benefits and enables you to participate in the discussions.
Benefits of registering include
Sad news, indeed.
Thailand cave rescue: former navy diver dies during operation – live
“25m ago 22:42
Jacob Goldberg, reporting for the Guardian, says that the diver died when he ran out of oxygen while placing air tanks at stages throughout the cave. His body has been sent to Suvarnabhumi airport in Bangkok and his hometown is Roi Et.”
“19m ago 22:50
The incident occurred at 1am local time (about nine hours ago).”