A safety system and method of an air distribution system of a tunnel structure is disclosed. In one embodiment, the air distribution includes a supply unit installed on a particular wall of the first set of walls to facilitate delivery of breathable air from a source of compressed air to an emergency support system of the tunnel structure, a fill site interior to the tunnel structure to provide the breathable air to a breathable air apparatus at multiple locations of the tunnel structure, a secure chamber of the fill site as a safety shield that confines a possible rupture of an over-pressurized breathable air apparatus within the secure chamber, a distribution structure that is compatible with use with compressed air that facilitates dissemination of the breathable air of the source of compressed air to multiple locations of the tunnel structure.
