The political party 'went underground' [=started working in secret] after the new government took power.
I've ridden on the New York subway, the Paris Metro, and the London 'Underground'.
The drugs are supplied through an 'underground' network.
(..) Wow, you've done a great job. And this is video game central. I've made it to Moscow on "Tony Hawk Underground." Hmm. That'll come in handy. You can't imagine the respect it bought me. Ho, boy, what have (..)2005 TvShow: Six Feet Under Title: Everyone's Waiting Season: 5 Episode 12
(..) Oh, big repair job less than a year ago. They completely redid the plumbing as well as all the underground drainage. - What did I tell you? - Wow! Yes, apparently, there was some sort of a... a problem. Eh, when everything (..)2005 TvShow: Six Feet Under Title: Everyone's Waiting Season: 5 Episode 12