Tunnels have been built over time for many different reasons and over the years we at GTEC have placed contract geotechnical engineers on site investigations on some famous tunnel projects. These have included the Channel Tunnel, London Underground tunnels, Hindhead tunnel, Whitmore tunnel, Silvertown tunnel, Thames Tideway Tunnel to name a few.
How about the longest underwater tunnel, would you know that? Well the longest road tunnel in the world is the Lærdalstunnelen in Norway. It runs for a total of around 24.5 km and was built between 1995 and 2000, and the longest underwater tunnel is the Channel Tunnel.
Test your knowledge here: https://interestingengineering.com/the-top-9-longest-tunnels-in-the-world