longest tunnel in the world

Tunnels are some of  the most amazing  displays of engineering .they handle traffic in efficient ways and are laid sometimes  through mountains and even water to meet the needs of highways and roads.

 LONGEST UNDERWATER TUNNEL IN THE WORLD :


THAMES TUNNEL (0.4)KM
   




The Thames Tunnel is the oldest underwater tunnel in the world and opened back in 1843. People came from across the globe to witness the Thames Tunnel, because it was the first tunnel to be built under a navigable river through the use of tunneling shield technology, which was new at the time. Located under the Thames River in London, United Kingdom; the Thames Tunnel connects the cities of Wapping and Rotherhithe. Although it was originally built for the purpose of horse-drawn carriages, today it forms a significant part of the London Overground railway network.