Thiess will construct a 4.3km tunnel under a section of water known as The Narrows to connect the mainland near Gladstone to the Santos GLNG liquid natural gas plant on Curtis Island.
The 3.4m internal diameter, segmentally lined tunnel will serve as the conduit for the Santos GLNG gas transmission line.
“LNG is the clean energy of tomorrow and this contract dovetails with our objective to become an integral part of the industry’s development,” said Thiess managing director Bruce Munro.
Thiess will construct the tunnel using a tunnel boring machine and the concrete segments used to line the tunnel will be cast on site.
Mobilisation is expected to start this month preparing for tunnelling activities to begin later in the year.