To relieve traffic pressure on the existing Harbour Bridge and Tunnel, the NSW Government sought expressions of interest to build a second tunnel to the Western side of the harbour in July 2020. In June 2021, NSW 2021-2022 budget allocated $6.3 billion over the next four years for the Western Harbor link to go ahead. In Dec 2021the geotechnical investigation was awarded to GHD and SMEC. HMA Geotechnical was selected to provide the instruments and installation equipment for boreholes in nine locations. Site work commenced mid-February 2022