2022 $1 ANDA Sydney 150 Years of Overland Telegraph PNC

On 22 August 1872, the Overland Telegraph line between Adelaide and Darwin was finally connected. It was the result of years of planning and 23 months of arduous construction through the arid centre of the continent and the wet, mosquito-infested terrain of the Top End. It dramatically transformed the speed and breadth of communications in the country and, within two months of opening, with the rest of the world via an undersea cable from Darwin to Java.