MEGA BRIDGE A MARVEL OF ENGINEERING The Hong Kong – Zhuhai – Macao Bridge is the world’s longest bridge-and-tunnel sea crossing with total length 55 kilometres. The bridge includes a dual three-lane expressway. The 7km sub-sea tunnel allows the passage of giant container vessels in the busy Pearl River Estuary. The lowest part of the tunnel is 46m below the water surface. The bridge required 420,000 tonnes of steel (60 Eiffel Towers). The road surface covers 700,000 sq m - equal to 98 football f