The Sydney Harbour Tunnel contract was awarded to joint venture partners Transfield and Kumagai Gumi in 1987. This privately financed $750 million tunnel was Australia’s first significant Build Own Operate Transfer (BOOT) project and is possibly Transfield’s most widely known enterprise.
Construction started in 1988 on the 4 lane, 2.3 km tunnel designed to reduce congestion on the Sydney Harbour Bridge.
Immersed tube technology was utilised and reinforced concrete caissons were constructed, floated into position and lowered onto the sea bed.
The Sydney Harbour Tunnel opened to the public in 1992 and is now used by an average of 90,000 vehicles per day.
Today Transfield Holdings owns the Sydney Harbour Tunnel Company in a joint venture with Kumagai Gumi and Olbia Pty Limited.
SYDNEY HARBOUR TUNNEL
From the Transfield Archives