Canning_Tunnel
The Canning Tunnel is a tunnel that originates just west of Canning Dam and runs for approximately 5.6 kilometres (3.5 mi) through the granite Darling Scarp to the western portal trunk main in Soldiers Road about 1 kilometre (0.62 mi) south of the Brookton Highway intersection. It measures 2.7 by 2.7 metres (8 ft 10 in × 8 ft 10 in). A separate 910-millimetre (36 in) pipeline from Canning Dam remains. The tunnel is more than 120 metres (390 ft) below ground level at its deepest point.