Watt was only allowed to import four technicians from Britain to assist - editor Inman Hunter, cinematographer Osmond Borradaile, production supervisor Jack Rixref and camera operator Carl Kayser. The rest of the crew were drawn from Australia.
Watt spent 1944 travelling the route of the trek. Dora Birtles researched the subject in government files and archives. She later wrote a novelisation of the script which was published.
== Casting ==
There were nine lead roles and the casting process took two months.ref Watt ended up selecting four professional actors, an experienced amateur, and four newcomers to films. Chips Rafferty, who Watt described as an "Australian [[Gary Cooper]]"ref was given his first lead role. Daphne Campbell was a nursing orderly who had grown up in the country but had never acted before. She was screen tested after her picture was seen on the cover of a magazine, and selected over hundreds of applicants.ref Peter Pagan had worked in Sydney theatre and was serving in the army when selected by Watt.ref Clyde Combo and Henry Murdoch were cast as the aboriginal stockmen; they came from because Harry Watt believed Northern Territory aboriginals did not speak English sufficiently well.ref
Chips Rafferty and John Nugent-Hayward were paid £25 a month for five months.ref