Sonia Hyland is underground on a treadmill. There are no windows and no one can hear her blasting Florence + the Machine.
She’s in a dugout, tucked into the cool earth of White Cliffs, a town in remote New South Wales. Outside, the thermometer regularly hits the mid-30s in summer – it once almost hit 50C. But inside these submerged homes, it hovers at about 20 to 22C.
