The given map delineate the layout of two tunnels in two distinct places in Australia.
Overall, the older tunnel took longer to build, but its construction cost was only a half of the newer one. Besides, the former is shorter in both length and height, and also narrower than the latter.
The construction of the older tunnel took place from 1986 until 1998, take a total of 12 years, while the other one was completed in only four years. However, the former only required $555 million in construction cost, the figure for the latter was twice as expensive, costing $1.1 billion.
Regarding length and height, the older tunnel was shorter in both catergories, with respective figures being 2.2 and 3.6 kilometres, and 1.5 and 2.5 kilometres
Similarly, the tunnel that constructed in 1986 was also narrower, allowing four vehicles to pass through simutaneously, two fewer than the other. It is also interesting to note that while the newer one was constructed under a highway with a layer of stone and clay underneath, whereas the older one was built what seems to be a river to connect both sides, seperated by a layer of sand.