I've been in that general area, yeah. You can reach the tunnels from 309; if you go north you won't have access until you get all the way through Hsiaoke Pass --

[This probably isn't helpful. He cuts himself short.]

I'd head to 309, take the tunnels wherever you want to go from there. The passage on the surface is harder. And I'm from Earth. Not this Earth, I don't think. At least, I hope not this Earth.

[A thought occurs to him.]

Actually, I don't think we're that far from you.