It was about midday on Thursday when paramedics in South Australia realised something was wrong. The state’s ambulance service, long strained by huge demand and ramping, was quieter than usual.
About the same time, a 70-year-old man in Adelaide began to panic. Chris Tyndall was struggling to breathe and, having lived through two heart attacks and a quadruple bypass, knew he needed help. He managed to get to his phone and dial triple zero.