I grew up as a “Navy Brat”. For those not official with the term it refers to those children who grew up with a parent that served in the Navy. This same “brat” designation applies to each branch of the service, but, I feel it is closer to the truth with those in the Navy. This, in part, is due to the fact that my dad would leave for six months at a time plus our mom had to deal with us alone. Then, he would come home plus try to change everything. This led to some rather rebellious attitudes for sure. As all of us got older, my brother started asking more questions about my dad’s job. Dad was stationed on a submarine plus life was truly different there. They would sometimes not surface for thirty days at a time plus my brother had all sorts of questions on how that worked. He wondered how they ate, slept, got scrub water, plus even fresh air. These were legitimate questions for sure. The 1 that interested myself and others was how they had fresh air to breathe. Dad explained that they depended heavily on the air filtration, oxygenator, plus Heating, Ventilation plus A/C systems on board to ensure that they were breathing the right ratio of air. If any of the Heating, Ventilation plus A/C, filtration, or air quality systems are not working properly the sub would have to surface to drawn in fresh air. This could be a extreme security issue as it would deliver away their position to anyone who wanted to know. My dad worked as a cook on the submarine so he was absolutely grateful to the electricians plus Heating, Ventilation plus A/C companies on board that kept them healthy plus safe while submerged for those long days.