The maps illustrate cross-sections of two tunnels , Mont-Blanc Tunnel linking French and Italy and the other connect two island, Hokkaido and Japanese.
Overall, it is clear that Senkan Railway tunnel is significantly longer than Mont-Blanc Road tunnel. Additionally, the Mont-Blanc Tunnel is shorter and passes beneath mountainous terrain rather than under the sea.
The Mont-Blanc road tunnel, constructed between 1957 and 1965, has a total length of 11.6 kilometers from French to Italy end. The tunnel runs beneath a high mountain and reach a maximum depth of 3.5 kilometers below its peak. As a road tunnel, its structure is relatively simple compared with the Japanese tunnel.
Regarding the Senkan Railway tunnel, it is considerably longer and more complex. Construction began in 1946 and completed in 1988, meaning it took over 40 years to finish, compared with just 8 years for the Mont-Blanc Tunnel. The tunnel measures relatively 53.85 kilometer and runs under the Tsugaru Strait, connecting Hakodate city with Aomori city. It lies 240 meters below sea level, highlighting the high-tech system demanded.
