The new Crossrail route includes a 26 mile (42km) section of tunnels beneath London. Five huge tunnelling machines are now in operation in west, east and southeast London with over 5½ miles (9km) of tunnels now built. Tunnelling is also well underway beneath central London station sites using Sprayed Concrete Lining ‘mining’ techniques to create a further 7.5 miles (12km) of platform tunnels and cross passages.Picture: CROSSRAIL

Credit : CROSSRAIL