Train: The girls drive their Kettenkrad onto a goods train, finding its carriages filled with broken down machines. They disembark at the last station and ride an inclined elevator towards the top of the building.
Wavelength: As they ascend, Yuuri starts hearing music coming from the radio she picked up earlier which they hear more clearly as they reach the surface.
Capture: The next day, as the girls explore a large hole for some drinking water, they discover a small long, white life-form. They discover that it can communicate with them using their radio. Naming it "Nuko", the girls decide to take it with them on their journey.