Follow her

You follow her into the house. Other than for its doors and windows it's an empty shell. She whistles at you as she vanishes into a under-the-stairs closet, and you continue to follow her lead. It's a small room, but what's really noticeable is the narrow tunnel, wide and tall enough for a person to crawl on their knees, dug out into the wall.

"Yeah, me and and a friend of mine dug this out, just for cases like this. Mind your head." You crawl through it, first brick, then cement, and then finally hard earth and sunlight. The tunnel must've been at least twenty meters long. You ask her how she managed it as you both wipe dust and dirt off yourselves. "Well we may have 'borrowed' some digging equipment. Took us maybe, uh... Almost two weeks actually."

"Anyway, we should be safe here. You're free to follow me to my professor, but if you decide to wander around, make sure you don't bump into any of the military types. They see you without an ID card, and they'll take you who knows where."