Light
They've been underground for so long, Estelle can no longer tell how long it has been. Hours? Definitely. Days? Possible. With no sunlight, and no breaks for meals or sleep, the circadian rhythm of a day has gone out the window. Her old life went out the window too, the moment she chose to follow Yuri. He'd protected her again and again, but she doesn't really know him, does she? After so long in darkness her optimism starts to wane. "Ah-ha!", he calls from ahead. A grinding noise, and a chink of wonderful daylight falls across her face. Daylight!