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Hi

A police officer is talking to a lady. He knows that she knows a guy he's looking for. For some time she lived at that guy's place, but now left it and moved to the hotel.

He asks her: You wouldn't have happened to have heard from him? Maybe he told you to take it underground?

I take it to mean: Is it possible that he didn't get in touch with you? Maybe he told you to hide yourself (that's why she changed her place of residence).

Is my interpretation pretty much correct?
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Sounds about right. "Underground" is an idiom for hiding.
Comments  
Thanks Vorpar!