I'm curious about how other GMs are portraying the Ork Underground. It's vast, it could be as large as Seattle as a whole, but we know so little about it. I've always found it interesting as a setting. Recently in my game, the players got a sort-of introduction to it, and have been meeting people at Big Rhino for intros and such.
Now, with the way Big Rhino was written up in Seattle 2072, (it's being featured in a tourist-style guide to Seattle), I figured it was a place that had more or less gone mainstream; as a result, the players (only two of whom are orks) have been safe when going there, no trouble or anything. They are, of course, respectful and don't start any trouble there.
I also dropped in a little thread about Ork Underground "tours" being run by an opportunistic Ork who was willing to exploit himself (and his people) to "adventurous" tourists. The idea is that he walks them through the upper areas of the Underground, never going too deep, and he puts on a big show (Orks would consider him to be something of a sell-out). I kind of pictured him wearing a Pith helmet with a flashlight, and maybe paying a few jobless orks to put on a "native" act when he brings tours around. He'd justify his work by pointing out that he *also* explains a lot of the Underground's history, and that his act humanizes Orks to outsiders as much as it exoticises them.