Nine
"Humph! Better future... I wonder who's future they were talking about."
Nine strokes his beard while he listens to Robin and Faust. "I guess you're right. There must be a way. Unless the generator went rogue after the rescue team came. As for that being the tunnel." He points at the map. "I don't know... It doesn't look much like a tunnel to me. And I suppose an emergency exit should lead to another place, not to the main entrance, that could be blocked... I guess this map don't show everything."
"But that's on the other side of the Generator Room." He says, looking again at the map and shaking his head. "Right now I'd check the security and generator status, because they may have some important info, and proceed to the canteen. There's no food, but we may find water and more useful things before figuring how to cross to the other side."
"And Faust has a point here. If they came for survivors it's because there is some organization up there. And they had more than a hundred years to rebuild before that. Unless they had time to make another war, which wouldn't surprise me much, the radiation should be gone by now, except perhaps in a few places." Nine looks at Robin. "So why do you think we won't like the outside? If fate had left us some food we could stay and use this place as our base while we scout the area, but without supplies it's complicated."