A vehicle comprising: an outer wall ; an insulation layer that extends along the outer wall ; a gap formed between the outer wall and the insulation layer , a cabin area formed within the insulation layer at a center of the vehicle ; and a system to passively remove moisture from air within the vehicle , the system comprising: a first duct that extends through the insulation layer , the first duct comprising an inlet positioned in the cabin area of the vehicle and an outlet positioned in the gap formed between the outer wall and the insulation layer ; a second duct that extends through the insulation layer , the second duct comprising an inlet positioned in the gap and an outlet positioned in the cabin area ; wherein: the second duct is positioned in the vehicle vertically below the first duct ; the inlet and the outlet of each of the first and second ducts are open and unattached to an air moving device; and the first and second ducts are positioned for enabling air within the vehicle to passively move through the first duct and into the gap , move downward through the gap where moisture in the air freezes against the outer wall , and move out of the second duct and back into cabin area , wherein the first duct has a smaller minimum cross-sectional area than the second duct . an outer wall ; an insulation layer that extends along the outer wall ; a gap formed between the outer wall and the insulation layer , a cabin area formed within the insulation layer at a center of the vehicle ; and a system to passively remove moisture from air within the vehicle , the system comprising: a first duct that extends through the insulation layer , the first duct comprising an inlet positioned in the cabin area of the vehicle and an outlet positioned in the gap formed between the outer wall and the insulation layer ; a second duct that extends through the insulation layer , the second duct comprising an inlet positioned in the gap and an outlet positioned in the cabin area ; wherein: the second duct is positioned in the vehicle vertically below the first duct ; the inlet and the outlet of each of the first and second ducts are open and unattached to an air moving device; and the first and second ducts are positioned for enabling air within the vehicle to passively move through the first duct and into the gap , move downward through the gap where moisture in the air freezes against the outer wall , and move out of the second duct and back into cabin area , a first duct that extends through the insulation layer , the first duct comprising an inlet positioned in the cabin area of the vehicle and an outlet positioned in the gap formed between the outer wall and the insulation layer ; a second duct that extends through the insulation layer , the second duct comprising an inlet positioned in the gap and an outlet positioned in the cabin area ; wherein: the second duct is positioned in the vehicle vertically below the first duct ; the inlet and the outlet of each of the first and second ducts are open and unattached to an air moving device; and the first and second ducts are positioned for enabling air within the vehicle to passively move through the first duct and into the gap , move downward through the gap where moisture in the air freezes against the outer wall , and move out of the second duct and back into cabin area , the second duct is positioned in the vehicle vertically below the first duct ; the inlet and the outlet of each of the first and second ducts are open and unattached to an air moving device; and the first and second ducts are positioned for enabling air within the vehicle to passively move through the first duct and into the gap , move downward through the gap where moisture in the air freezes against the outer wall , and move out of the second duct and back into cabin area , wherein the first duct has a smaller minimum cross-sectional area than the second duct . <EOS>