Another word for the London Underground is "the Tube." This term is commonly used by locals and visitors alike to refer to the city's extensive subway system, which serves as a primary mode of transportation across Greater London. The name "Tube" derives from the shape of its deep-level tunnels.
London Underground is known by Londoners as 'the tube'.
subterranean
London Underground was created in 1863.
Apply to London Underground Ltd.
aquifer
Catacomb
dungens
The London Underground is the largest in Europe and the oldest in the world.
In London Underground (tube) stations.
The London Underground did give the East London line to the London Overground to ease its traffic.
The London Underground. Travel For London (TFL) is responsible for the London Underground and the other transport networks in London.
A Den. Cave. Underground lair