The Channel Tunnel, also known as the Eurotunnel, is a 50.45-kilometer (31.4-mile) underwater rail tunnel that connects Folkestone in the United Kingdom to Coquelles near Calais in France. Opened in 1994, it allows for the transportation of passengers and vehicles between the two countries, significantly reducing travel time across the English Channel. The tunnel consists of three parallel tunnels: two for trains and one for maintenance and emergency access. It is a vital link for trade and tourism, facilitating millions of journeys each year and contributing to the economic relationship between the UK and Europe.