Since there is no more gas to vent into the suit, the suit does not vent anymore co2 out of the suit as he uses up the oxygen he makes more co2 this will result in Hypoxemia or respiratory failure.
Hypoxemia is characterised by low amounts of oxygen in the blood. It causes headaches, trouble breathing, a high heart rate, and blue skin.
Respiratory failure is a condition in which your blood lacks oxygen or contains too much carbon dioxide. Both difficulties might occur at times.
When you breathe, oxygen enters your lungs. The oxygen enters your bloodstream and travels to your organs. Your organs, such as your heart and brain, require oxygen-rich blood to function properly.
Another aspect of breathing is exhaling carbon dioxide from the bloodstream. Too much carbon dioxide in your blood can be harmful to your organs.
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