Sydney extend the system through the CBD by 2024. At the time the Sydney Harbour Bridge opened in 1932, the city's ferry service was the largest in the world. Patronage declined from 37 million passengers in 1945 to 11 million in 1963 but has recovered somewhat in recent years. From its hub at Circular Quay the ferry network extends from Manly to Parramatta. Sydney Airport, officially "Sydney Kingsford-Smith Airport", is located in the inner southern suburb of Mascot with two of the runways going into Botany Bay. It services 46 international and 23 domestic destinations. As the busiest airport in Australia
Sydney Harbour Tunnel South) to the Sydney Harbour Bridge, which has eight lanes, with a tidal flow operation. In 2008, the tunnel was carrying around 90,000 vehicles per day. The tunnel is made up of three sections: twin land tunnels on the north shore, twin land tunnels on the south shore and a immersed tube (IMT) structure. The tunnel falls about from the northern entrance and about from the southern entrance to its deepest point, below sea level. The IMT structure consists of eight precast concrete units. The units were constructed over away in a casting basin at Port Kembla and then towed