At the time, it was built it was considered one of the seven wonders of engineering. The Chesapeake Bay Bridge-Tunnel is, as its name suggests, a bridge that turns into a tunnel.
The work was completed in 1964 and cost 200 million dollars. The unprecedented structure that stretches along the Chesapeake Bay in Virginia (USA), connects Northampton County on the Delmarva peninsula to Virginia Beach.
Originally the tunnel bridge combined 19 km of board with two 1.6-kilometer tunnels, four artificial islands and four bridges. Since its opening in 1964, the tunnel bridge has been crossed by 100 million vehicles, as it is part of a major road linking the north and south of the US – the Route 13.
The tunnel bridge was created to allow the circulation of boats in the Cheasapeake Bay and has become one of the region’s major tourist attractions, as it is one of the only ten tunnel bridges in the world.
Now a $ 775 million contest has been launched to build a parallel tunnel and double the track due to the high traffic that runs through it. Works are due to start this fall and are expected to be completed by 2020.