What is a sign that a diver might be experiencing nitrogen narcosis?

A sign that a diver might be experiencing nitrogen narcosis is confusion or disorientation. Nitrogen narcosis occurs when a diver is exposed to increased partial pressures of nitrogen at greater depths. This condition affects the central nervous system, leading to symptoms similar to those of alcohol intoxication. Divers experiencing nitrogen narcosis may not be able to think clearly, make decisions, or maintain situational awareness, resulting in a potential increase in risk while diving.

The other options do not align with the effects of nitrogen narcosis. Increased energy levels are typically not a symptom; rather, divers may feel lethargic or impaired. Lower oxygen consumption is unrelated and does not signify nitrogen narcosis, as this condition specifically concerns the effects of nitrogen, not oxygen management. Enhanced communication skills are also contrary to the experiences of divers affected by narcosis, who may struggle to articulate thoughts or respond coherently. Overall, confusion or disorientation is a primary indicator of nitrogen narcosis, making it the correct answer.