"Food and fuel," Ty confirmed. "They’ve been down in their hole living on God only knows what—cave tofu or something—since the beginning of the Hard Rain. Every so often maybe they would sample the air outside. When it became breathable they probably went out and had a look around. But it was still a wasteland, not capable of supporting life. It’s only in the last few years that TerReForm has seeded that part of Beringia with animals big enough to be worth the effort expended in hunting them. That was the starting gun—the signal for them to come out."