What should divers do if they feel symptoms of oxygen toxicity during a dive?

In the event that divers experience symptoms of oxygen toxicity, ascending to a shallower depth is the correct course of action. Symptoms of oxygen toxicity can include visual disturbances, nausea, twitching, and other neurological effects that can become more severe with increased exposure to high partial pressures of oxygen. By ascending, the diver can reduce the partial pressure of oxygen inhaled, which helps alleviate the symptoms and minimizes the risk of serious complications.

Remaining at the current depth, increasing oxygen intake, or waiting to notify a dive master would not address the immediate risks associated with oxygen toxicity. It is crucial to act promptly in this scenario, as descending deeper or delaying action could lead to more severe effects, potentially endangering the diver's health.