It once again slides up slowly and silently before opening up to what's probably the HQ. It's a large, spacious room with sofas, a couple of bookshelves, potted plants, and a desk surrounded by monitors and computers.
And a girl, about the same age as Walta, sitting there with her feet propped up on the desk, eating a bun of some kind and idly using (one of) the computer(s). She looks up from it casually, takes Walta in, looks back down, and then up again suddenly with a startled "eep!" which causes her to fall off the chair.