A gigantic but highly flexible Chinese tunnel boring machine is helping to carve out Sydney’s second major highway artery deep beneath the harbour, as China, dubbed an “infrastructure maniac”, exports more of its advanced technologies and sophisticated machinery.The machine is currently operating in the Australian economic hub for the construction of the Western Harbour Tunnel project, a 6.5km (4 miles) tunnel featuring three lanes in each direction, which is expected to be completed in 2028,...