The Gorgon team managed the technical challenges of developing the subsea gathering system through engineering practices, such as an intensive research and qualification program. After moving into the front-end engineering design stage in 2005, the concept matured to a diver-less system built by remote-operated vehicles with multiple drill centers. The design incorporated the flexibility to shut in without impacting adjacent production, the option to enable future field tie-ins and a provision for future compression platforms.
To transport gas from the two fields to Barrow Island required some 500 miles (800 km) of offshore pipeline, including about 125 miles (200 km) of main production pipeline. Accessing the Jansz-Io field demanded a high level of innovation to resolve an evolving suite of significant engineering challenges. It required crossing a very steep slope known as an escarpment or scarp in about 1,640 feet (500 m) of water at the top, down to a water depth of almost 2,500 feet (750 m). Typically allowable span lengths for subsea pipelines are around 131 feet (40 m). However the steepness of the seabed profiles at the scarp crossing resulted in pipeline-free spans up to 885 feet (270 m) in length.