A former Thai navy diver has died while taking part in efforts to rescue 12 boys and their football coach trapped in a flooded cave in Thailand.
Petty Officer Saman Gunan lost consciousness on his way out of the Tham Luang cave complex, where he had been delivering air tanks.
“His job was to deliver oxygen. He did not have enough on his way back,” the Chiang Rai deputy governor said.
PO Saman was brought out by his dive partner but could not be revived.
The oxygen level in the chamber where the boys have taken refuge has fallen to 15%, officials said at a news conference. The usual level is about 21%.
The boys and their coach ventured into the cave while it was dry, but were trapped by a sudden deluge of rainfall. Ten days later British rescue divers found them perched on a rock shelf about 4km (2.5 miles) from the cave mouth.