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Owen has been put into the climate chamber by Jem Cheng, a research fellow at the Heat and Health Research Centre at the University of Sydney.

It’s part of a world-first study all about finding out at what point heat becomes deadly. Fifteen years ago, scientists proposed an environmental threshold at which no person would be able to survive for six hours.

But these conditions have never been tested on humans.

Until now.

“This study is all about human survivability,” Dr Cheng says.

“So we are the first to actually put people in these environments to actually see, physiologically, what is happening to their core temperature or to their heart rate.

What this new model shows is, when you take into account the limitations of human physiology, these upper wet-bulb temperature limits look as though they are much lower under certain types of conditions.”