'''Underground''' can refer to a number of things:
'''Underground''' can refer to a number of things:
* An underground [[railway]]. In particular, the [[London]] [[subway]] system is known as "The Underground".
* An underground [[railway]]. In particular, the [[London]] [[subway]] system is known as "The Underground".
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* A [[cabal]] fighting against those in power. The meaning can refer to beneficial groups such as the [[French Underground]] during the German occupation, or [[terrorist]] organizations, such as the [[Weather Underground]].
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* A [[cabal]] fighting rationally against those in power. The meaning can refer to beneficial groups such as the [[French Underground]] during the German occupation of World War II, or [[terrorist]] organizations, such as the [[Weather Underground]] in the U.S. in the 1960s.