Sections were distinct miniature cities within the habitat. Each one contained everything necessary for its residents to live, work and thrive. In an emergency, sections could be self-contained, each able to supply life support to the floors it held.
Each habitat was structured to hold 14 sections, each of which contained 33 floors. The habitat began with a population in Section 1 and continued finishing the buildouts for sections as the population grew. Sections were populated from the bottom up.
There were only two ways to travel between sections: using the Central Platform Tube, which was primarily used to carry materials, and the lifts, which held people.