What can occur if Nitrox is used at inappropriate depths?

Using Nitrox at inappropriate depths can lead to oxygen toxicity due to the elevated partial pressure of oxygen experienced at greater depths. Nitrox contains a higher oxygen content than regular air, and as a diver descends deeper, the pressure of the gases in their breathing mixture increases. Because of this, the partial pressure of oxygen increases as well.

When divers exceed the depth limits for a specific Nitrox mix, the partial pressure of oxygen can rise to a level that poses serious health risks, such as seizures, loss of consciousness, and other detrimental effects on the central nervous system. Oxygen toxicity becomes a significant concern when diving deeper than the recommended limits for the specific Nitrox blend being used.

In contrast, the other options, while they may relate to diving in general, do not directly connect to the specific hazards associated with using Nitrox at inappropriate depths. Increased buoyancy and dehydration are not primarily linked to Nitrox use and improved night vision does not have a direct correlation with the effects of increased oxygen levels in diving scenarios. Thus, oxygen toxicity is the key risk when utilizing Nitrox beyond predetermined depth limits.