The Channel Tunnel
The Channel Tunnel was officially opened on the 6th May 1994, providing an undersea rail link between England and France. The tunnel, which is just over 50 kilometres long, actually consists of two rail tunnels and a service tunnel. In this photo, French and English tunnel workers shake hands after a giant drilling machine broke through the last section in June 1991.
Ideas for an underground link between England and France were conceived in as early as 1802 when Albert Mathieu drew up a plan involving horse-drawn carts and a manmade island. Issues which delayed the construction included problems identifying a suitable geological path, concerns over ventilation and anxieties about defence as England was worried the tunnel might prove an easy route for invaders to cross the Channel.