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Nate! [ Damnit kid, don't go dying right when you get here. Desmond will kick your ass. ]
No one has entirely mapped the Underground. [ Desmond is already at the ruins of the Residential District, as one can tell from the background. ] There are some signs that we've put down there. Just keep an eye out for them and you'll see them.
[ A little idea Desmond picked up from the Undergrounds of Boston and New York--except they're the assassin symbols and not Free Mason symbols. ]