In some embodiments, the present disclosure provides a method to process high pressure air into low pressure breathing air for one or more sealing and locking helmets and/or one or more air respirators. Other embodiments include a system configured to perform such a method and a manufacturing process of making such a system. In some embodiments, the breathing system automatically fills a local reserve bottle by pressure equalization. In this regard, the secondary supply bottles will fill the backup bottle when the console module operator (CMO) connects the secondary air supply to the system. The backup bottle will then be isolated from depletion during normal operation by means of a check valve to prevent back flow of the emergency cylinder into the secondary air supply. The local reserve bottle will protect against loss of air on any of the high pressure air hoses.