Overall, there are several disparities between the two passageways, including their expenses, dimensions, distances, construction duration, and surroundings. The first tunnel required almost half the cost in comparison to the second tunnel, yet it was notably shorter in length and had a lower capacity for vehicles.
To begin with, the construction of the initial tunnel, spanning 12 years from 1986 to 1998, required a substantial investment of $555 million and it was constructed under a challenging landscape of water and sand. In comparison, the second tunnel was completed in just four years, but at a significantly higher cost of .1 billion and it was built under stone and clay layers.
Moving further, a striking difference between the two tunnels is their size, with the first being 1.5 meters tall and 2.2 kilometers in length, and the second standing 2.5 meters high and spanning 3.6 kilometers. Furthermore, the initial tunnel has a width of four lanes, while the second had six lanes.