The six tunnels are: East Lantau Tunnels (1994), Tsing Yi Tunnels and Viaducts (1994), North Point to Tai Koo Tunnel (1982), Tin Hau to North Point Tunnel (1982), Choi Hung to Kowloon Bay Tunnel (1975), and Choi Hung to Diamond Hill Tunnel (1975).The four foundation works are: Tseung Kwan O Area 86 (2007); Tsim Sha Tsui Station – Trial Trenches (2007); Wu Kai Sha Station (2006); and Olympic Station (1997).The Kowloon Bay Deport project included ground works and builder works.