What is a characteristic of nitrogen narcosis?

Nitrogen narcosis is a condition that can occur when divers are exposed to high concentrations of nitrogen under increased pressures while diving. The primary characteristic of nitrogen narcosis is indeed a decrease in awareness, often leading to impaired judgment and cognitive function. This phenomenon is similar to the effects of alcohol intoxication, resulting in altered mental states.

Divers experiencing nitrogen narcosis typically exhibit confusion and a diminished ability to assess risks effectively, which can lead to dangerous situations if not recognized.

While some divers may feel a euphoric or heightened sense of well-being in initial stages, overall, the condition detracts from a diver's awareness and decision-making capabilities. Therefore, the correct response highlights the decrease in awareness as the defining feature of nitrogen narcosis, making it crucial for divers to be conscious of their depth and to monitor their mental state while diving.