An Australian doctor is one of the international dive experts at the centre of the effort to rescue a group of Thai boys and their football coach trapped in a cave in Chiang Rai.
Dr Richard Harris, an anaesthetist from Adelaide, undertook the dangerous dive to the boys and their coach on Saturday.
On Saturday, Dr Harris undertook the dangerous dive through to the 12 Thai boys and their coach.
He gave the final approval on the boys' health, clearing the way for the rescue attempt which commenced on Sunday.
It is understood the British divers participating in the rescue specifically requested Dr Harris, and that he went back into the cave helping in the rescue effort.
"He's been diving for over 30 years, and readily embraced advances in diving technology to better help him explore and photograph caves in Australia and overseas," a dive event organizer said.
"In the past few years, he's been involved in cave-diving explorations in Australia, China, Christmas Island and New Zealand. He has an active interest in diving safety and accident investigation.
"Quite apart from his own cave exploration experiences, as an anaesthetist and a medical professional who is also involved in retrieval medicine, he has always struck me as a person who is capable of calmly assessing any situation and then acting appropriately.
"Richard is just one member of a team of uniquely qualified and extraordinary people prepared to sacrifice their own comfort, safety and wellbeing for the benefit of others. It's an over-used term, but all of those involved are true heroes".