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London Underground is known by Londoners as 'the tube'.
subterranean
London Underground was created in 1863.
Apply to London Underground Ltd.
The London Underground is the largest in Europe and the oldest in the world.
aquifer
Crypt.
Crypt.
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