Which of the following is a common symptom of nitrogen narcosis?

Visual distortions are a common symptom of nitrogen narcosis. This condition occurs when divers descend to depths typically greater than 30 meters (100 feet), where increased pressures affect the way nitrogen acts in the brain. As nitrogen is absorbed into the nervous system, it can lead to alterations in perception, including changes in visual acuity and distortions. Divers may experience an overwhelming sense of euphoria or a feeling of being intoxicated, which can affect their judgment and coordination.

In contrast, the other options, while they may occur in certain diving scenarios, are not hallmark symptoms of nitrogen narcosis. Extreme fatigue might be due to other factors such as physical exertion, environmental conditions, or a lack of adequate rest. Shivering uncontrollably is typically associated with hypothermia rather than nitrogen narcosis, and excessive sweating is more likely to be related to stress, anxiety, or other physiological responses during a dive. Recognizing visual distortions as a symptom is crucial for identifying nitrogen narcosis and ensuring divers can respond appropriately to maintain safety underwater.