Hall - Four Way

Pressurized hallways are the backbone of the colony. Most buildings connect to hallways. Hallways must be filled with oxygen, or colonists get very sad. Hallways have bulkhead doors at each end which may be opened or closed, to control the flow of oxygen or colonists between compartments.

A Hall - Four Way can be upgraded to an Arboretum. As of v0.84, upgraded halls costs one additional kW, 20 kg ore and 20 kg clay, but does not provide any benefit. As of version 1.02, they do not require any more power, only costing 20 ore and 20 clay. They also provide a slight increase in oxygen level to surrounding tiles. In the event of space weather, such as solar flares, dust storms or meteorite impacts, Hallways can shut their windows. This looks really cool, and gives colonists a nice sense of security, which is unfortunately completely false. Fortunately, Hallways can be improved with actual armor, by researching Hallway Armor in the Geology Lab.
 * Cost: 1 supply
 * Consumes: 1 kW
 * Footprint: 2x2