A sewage ocean outfall is being built at Burwood Beach in Newcastle to stop pollution. The project includes a vertical shaft and a tunnel with diffuser outlets to release sewage into the sea. The tunnel will be dug through alluvial material and rock, with flexible construction methods for the contractor. The location was chosen below colliery workings after considering different options. The project is complex due to the nearby coal mines, but valuable geological information was obtained from their records.