aerial photograph of the Eurotunnel entrance at Folkstone Kent England UK.The Channel Tunnel was opened in 1994 and runs for 31 miles to Calais in France. The tunnel runs 75m below the English Channel seabed and is the longest underwater tunnel in the world.The Tunnel carries over 10 million passengers and one million tuns of freight each year through the Eurostar , freight and Eurotunnel Shuttle services