Our very own Channel Tunnel is a 31.35 mile long rail tunnel beneath the English Channel connecting Folkestone to Coquelles near Calais. It consists of three separate tunnels; two 7.6m diameter single tracks, single direction rail tunnels which are 30m apart, and one 4.8m diameter service tunnel between them. It was a megaproject with several false starts, but was finally completed in 1994. It is the second-longest rail tunnel in the world, but the undersea section at 23.55 miles is the longest undersea tunnel in the world. The American Society of Civil Engineers has declared the tunnel to be one of the Seven Wonders of the Modern World.
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