I see why you'd find doing that with a Drow or Deep gnome to be more reasonable, but my issue is still that, unless you have a particular backstory, they still don't *really* know what they're jumping into. We don't know where our character was taken from. They could from anywhere. So to me, assuming that an underdark native would be comfortable jumping into any part of the underdark without further information would be like assuming a Russian who lives in one city could comfortably drop to any random other point in the country and find something of use. And it's still super likely that they're jumping into a stretch of nothing where people just don't live.
Sorry to harp on this, it just bothers me.
