There's a scene in this episode where the dome is calcifying and christine tells junior that no living thing will be able to breathe. Why would they not be able to breathe? Even if the dome doesn't let any air in from the outside there's still plenty of air in the dome and plenty of trees and sunlight to keep everyone alive indefinitely. The dome is 10 miles wide with lots of forest and there's a lake so there's plenty of water. It makes no sense that they will somehow run out of air just because they cant get air from the outside of the dome. This is just another example of how some of the scenes in this series are completely irrational.
