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The primary purpose of the ventilation system onboard US Navy submarines is to condition and move air throughout the ship to maintain design conditions in all compartments. A second and equally important function of the system is to emergency ventilate any compartment within the ship. The emergency ventilate mode is the means used for evacuation of a specific compartment of atmospheric contaminants such as smoke, toxic gas or other objectionable or noxious gases. In this mode, a supply of fresh air is established into the effected compartment while a second path is established to exhaust its content. This paper will discuss the ship's normal ventilation system, emergency ventilation system, and emergency air breathing system.