Longest tunnel in UK is 17 miles and is used by 900,000 people every day
The longest tunnel in the UK might come as a surprise to some. It is actually hidden from sight yet is used by an average of 900,000 people every single day.The UK has long been known for having some of the world's most successful and ambitious infastructure. Perhaps most famous is the London Underground. The world famous maze of tunnels connects England's capital miles underneath the iconic skyline.Yet one of its lines holds the title of having the longest tunnel in the UK. The Northern Line stretches for an impressive 17 miles and has carried millions of passengers since it opening in 1937.It's London's busiest Tube line, carrying approximately 900,000 passengers every day and transporting more people annually than any other underground line, according to the London Assembly. Its trac...










