Below are possible answers for the crossword clue Underground.
5 letter answer(s) to underground
METRO
an electric railway operating below the surface of the ground (usually in a city); "in Paris the subway system is called the `metro' and in London it is called the `tube' or the `underground'"
12 letter answer(s) to underground
SUBTERRANEAN
being or operating under the surface of the earth; "subterranean passages"; "a subsurface flow of water"
lying beyond what is openly revealed or avowed (especially being kept in the background or deliberately concealed); "subterranean motives for murder"; "looked too closely for an ulterior purpose in all knowledge"- Bertrand Russell
underground
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