It was an inevitability, thought Australian cattle farmer Donald Graham and his wife Bronwyn, that bushfires would one day tear through the bushland that surrounded their home, a remote property overlooking the Snowy River National Park.It’s the reason they installed two concrete bunkers on their property in December 2018, a year before devastating fires would roar up the nearby gullies.“We thought it was just a matter of time, that definitively there would be a fire,” said Graham, a 68-year-old with a shock of white hair, “So we put the two bunkers in.”It was a decision that would save their …