"I've discovered something we're calling 'Dream State Travel', or DST. Volunteers testing my new, nootropic supplement have been consistently returning to the same SHARED environment during near-sleep. What seemed an impossible coincidence, is actually an interconnected 'collective subconcious' world--apparently constructed by memories of places the Travellers have been to, read about, or invented.
"Tonight, I'm taking in my awareness of Dome A. Exploring it there will be much easier, and I want to assess the world's validity by comparing data taken on-site to our findings in DST."
"And, you want me for...what?"
"You're a cartographer. We need maps!"