Building The Channel Tunnel: 25 Years On

The Channel Tunnel is one of the seven wonders of the modern world but what did it take to build the longest undersea tunnel ever constructed? It's the 25th anniversary of its opening; a project that's been blighted by flood, fire, tragic loss of life and financial bust ups. Today, it stands as an engineering triumph and a testament to what can be achieved when two nations, Britain and France put aside their historic differences and work together.