The standard living and facility space — the backbone of any practical base. Configurable in size (small, medium, large) and shape. Houses every Interior Facility: Fabricator, Processor, Biolab, NoA Terminal, Battery Terminal, Power Cell Terminal, Biobed, Lockers, Bioreactor.

Like Corridors, Rooms have no structural integrity penalty in SN2 — you can build a Large Room at 500 m depth without reinforcement.