I found the old haunt of the Manhattan Fireflies, a resistance group made of former Valkryie operatives. Their commander was a Technomancer... with his help, they made a base underground that was completely off the grid.

[It is actually a piece of history of the Darkest Vigil that Cindy had always loved to read.]

They were the ones who helped the Methuselah, Netsach, and Zangyaku liberate New York from Grendal.