It is public challenge to the government and officials. We can not assume that everyone will die, but it tells us how hard it is.
Here is the further info:
Former Sgt. Saman Kunan, 38 , who was working as a volunteer alongside rescuers, died between 1 and 2 a.m. Friday local time.
SEAL commander Arpakorn Yookongkaew said Kunan died placing oxygen canisters underwater along the route to the stranded boys. The Evening Standard notes this is the current method for replenishing air supply in the cave, where 12 boys and their soccer coach have been trapped since June 23. Kunan passed out and efforts to resuscitate him failed.
A Facebook profile remembering Kunan, with an adventurous spirit — bicycling and racing, clad in athletic gear. After retiring as a navy SEAL, Kunan became a triathlete and worked as an airport security officer.