August 2022 marked the 150th anniversary of the completion of the Overland Telegraph Line, which connected Australia to the rest of the world by telegraph for the first time in 1872.
I have a family connection to the OTL. My father was instrumental in organising and running telegraph demonstration events at the Alice Springs telegraph station during the 1990s and early 2000s. Using a leased telephone line, operators in Alice Springs and Canberra exchanged messages via Morse code. He wrote an article about this which appeared in Morsum Magnificat, vol 17.
The OTL was a major technological achievement in its day, but its development and operation had dramatic consequences for indigenous people along its route. See Aboriginal Interactions with the Overland Telegraph Line, 1870–1880 (Philip Jones, South Australian Museum), The Overland Telegraph Line: A Transcultural history, and this National Indigenous Times article for more information.
Many thanks to Stuart, Andrew and the other OTL enthusiasts who made this trip possible. See History Festival: Overland Telegraph Lines celebrates 150 years for more details about the anniversary event. Andrew also has a good writeup of the trip.