The diagram illustrates the comparison of two tunnels.
Overall, it can be seen that they are different about the measurements, surrounding area, building-time, expenditure and capacity.
Specifically, with 3.6 kilometers long, the second tunnel, which was built 2.5 meters deep underground, was longer and deeper than the first, which was 2.2 kilometers long and 1.5 meters deep. The first tunnel was constituted underneath the river-spanning bridge, while the overground of the second was an urban area with modern buildings and vehicular traffic. The tunnel above terrain is composed of sand, compared to sand and clay, which make the tunnel below stronger.
The year 1986 recorded the construction of the river-spanning tunnel, after 12 years, it was completed, in comparison with only 4 years for building the second tunnel. In addition, the first tunnel accommodated 4 lanes of road, which was 6 for the second. On the other hand, the below was spent 1.1 billion on architecturing, meanwhile, the above was expended less than a half.
