Video footage has been released showing the vessel for the Ichthys LNG project setting sail from South Korea.
The FPSO left the yard in Okpo earlier this week and is en route to Australia.
Ichthys, about 220 kilometres offshore Western Australia, is the largest discovery of hydrocarbon liquids in Australia in 40 years.
Operated by Inpex, it is expected to have an operational life of at least 40 years.