How did Mack keep himself alive, under a rolled-car, in remote Western Australia?

Flying Doctor Podcast #58:

This story is about 19-year-old Mack, who had been mustering out near Fitzroy Crossing in remote Western Australia three years ago. 

He and a mate Josh were driving back to the station from Falls Creek which turned out to be a life-changing event for them and their families. 

Losing control of the car, they rolled the Landcruiser they were driving at a speed of 90 km/h. Listen to this survival story of Mack who was crushed by the upside-down vehicle and had to wait for 3 hours for someone to find them. 

Sally, his mum works for St Johns Ambulance in Darwin on the triple 000 line. Listen to this spine-tingling story below.