How a line of poles across the desert closed the gap between a colony and the world — and what it meant for the people already living along its path.
Before 1872, news from Europe arrived by ship — a round-trip question and answer could take the better part of a year. For a colony trying to trade and govern, that lag was a wall.
Postmaster-General and astronomer Charles Todd proposed a line straight up the centre of the continent to Darwin, where it would meet an undersea cable to Java and on to the world.
Roughly 3,200 km, 36,000 poles and 11 repeater stations, driven through country most surveyors had never crossed — supplied in part by Afghan cameleers and following routes Aboriginal people had used for millennia.
In 1872 the line connected. A message that once took months now reached London in hours. Business, newspapers and government re-organised themselves around the new speed of information.
The wire was a triumph of colonial engineering. It was also run through the lands and songlines of Aboriginal nations who had no say in it.
The episode holds both truths at once. The Overland Telegraph ended Australia's isolation and remade its economy — and its poles crossed Country that had been navigated by Aboriginal trade routes long before any surveyor arrived, with lasting consequences for the people who lived along the line. It's the same tension that runs through every system in this series: what a system makes possible, and what it costs to build.