Wanderlust World Wanderlust World The Channel Tunnel (Chunnel) is a 50.5-kilometre (31.4-mile) undersea rail tunnel linking Folkestone, Kent, UK with Coquelles, Pas-de-Calais, France (near Calais). It runs beneath the English Channel at the Strait of Dover. The tunnel comprises three bores: two rail tunnels (7.6 m diameter) and a service tunnel (4.8 m). It carries Eurostar high-speed passenger trains, LeShuttle vehicle transporters, and freight. Opened in 1994, it is the world's longest undersea tunnel section (37.9 km).