The Channel Tunnel (French: le tunnel sous la Manche) is a 31 mile (50.5 km)-long rail tunnel beneath the English Channel at the Straits of Dover, connecting Folkestone, Kent in England to Coquelles near Calais in northern France. A long-standing and very expensive megaproject that saw several false starts, it was finally completed in 1994. It is the second-longest rail tunnel in the world, surpassed only by the Seikan Tunnel in Japan, but the undersea section of 24 miles (39 km), is unsurpassed in the world. It is operated by Eurotunnel.

The Franco-British Channel Fixed Link Treaty was signed...