The provided maps depict two Australian cities’ underground tunnel systems for transport.
Overall, the tunnels differ in structures, location, sizes, and purposes of use.
Examining the details, the first underground tunnel was constructed from 1986 to 1998 and cost 555 million dollars. It is 2.2 kilometers long, situated 1.5 meters underground, and accommodates two cars in width. According to its location, it is under the lake, and the soil above consists of sand.
On the other hand, the tunnel in the second city is significantly larger: 3.6 kilometers long, accommodates three cars in width, and, by contrast, is straighter. It was built between 2002 and 2006, completing three times faster than the first tunnel. However, the price was twice higher due to speed of construction, larger size, and possibly location. The placement of the tunnel seems to be in the downtown area with busy traffic and the soil above is composed of stone and clay, which may be more stable in future usage.