 While they find temporary shelter in the dining wagon, Nobuo gives in to fear and declares that "something" is lurking in the tunnel with them.Nobuo's mental state deteriorates to the point where he claims the wrecked train for himself, forcing Teru and Ako to build a makeshift shelter outside in the tunnel.After days pass with no sign of rescue, Teru tries to find an escape route and ventures into a partially collapsed ventilation shaft.