Labyrinth, Cooking (迷路, 調理) is the 7th episode of the anime adaptation.
The girls enter a labyrinth of large pipes while following Ishii's map to a food manufacturing plant. Chito struggles with her fear of heights as she and Yuuri walk on top of the pipes before discovering there is a actually pathway inside them.
They eventually find a facility filled with machines and cooking ingredients; powdered potato, sugar and salt. The girls deduce that they were used to make rations, and using the ingredients they bake their own food bars using one of the huge ovens.