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The Channel Tunnel or Euro Tunnel is one of the world's longest underground rail tunnels, and links England with France. Consisting of two rail tunnels and a. The Channel Tunnel or Euro Tunnel is one of the world's longest underground rail tunnels, and links England with France. Consisting of two rail tunnels and a. The Langeled pipeline (originally known as Britpipe) is an underwater pipeline transporting Norwegian natural gas to the United Kingdom. Before the completio. World Top 10 Longest Underwater Tunnels 1. Seikan Tunnel -- 53.9 km -Japan's Seikan Tunnel is the longest underwater tunnel in the world, and is located bene.