Third Leyland Brothers expedition documentary. The first was 'Down the Darling' and the second was Wheels Across a Wilderness (1967).
This film was originally broadcast on television in Australia in 1971 in two one hour parts across two evenings.
Mal Leyland and Mike Leyland were aged about 26 and 29 years respectively when this film was made and released.
The expedition traversed about 5000 miles (= 8046.72 kilometers).
The name of the boat was "The Little Investigator".