| One of the most unexpected uses of the underground passages took place during the Second World War when thousands of civilians used them as shelter from the German bombers during the Blitz. They saved thousands of lives, but unfortunately some such shelters suffered direct hits from enemy bombs, which cost several hundred civilian lives. |
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The 1970s saw the modernisation and automation of the underground and the introduction of extensive safety controls. Today London's underground system is one of the most extensive in the world, covering more than 650 square miles.
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