Crossword clues for London's underground:MINDTHEGAPLondon Underground warningTHETUBELondon UndergroundMINDTHEGAPLondon Underground warning equivalent to "Watch your step"SUBWAYSERIESParis Métro-BART-London UndergroundMETROLondon : Underground :: Paris : ___GAPMind the ___ (London Underground warning)TUBELondon Underground, with "the"PRAMFour-wheeler allowed on the London UndergroundMETROParis equivalent of the London UndergroundTUBELondon Underground nickname, with "the"TUBELondon undergroundTUBEUnderground in LondonTUBELondon's underground, informallyTHETUBELondon's underground, familarlyTHETUBELondon's undergroundTHETUBELondon's underground, informally