What can happen to a diver if nitrogen narcosis occurs?

When nitrogen narcosis occurs, a diver experiences an altered mental state due to the effects of inert gases, primarily nitrogen, at high pressures underwater. At greater depths, the solubility of nitrogen in the body's tissues increases, leading to a narcotic effect that can impair cognitive and motor functions. This can range from mild euphoria and increased sociability to confusion and impaired judgment, resembling the effects of alcohol intoxication.

Understanding nitrogen narcosis is crucial for divers, as it can lead to poor decision-making and reduced awareness of their surroundings, potentially increasing the risk of accidents or dangerous situations underwater. Awareness of how nitrogen narcosis affects mental and physical capabilities reinforces the importance of diving within safe limits and recognizing the symptoms early.

The other options, while they address legitimate concerns for divers, do not directly relate to the specific effects of nitrogen narcosis. Ear pain, buoyancy issues, and increased lung volume are associated with different diving conditions or problems but are not indicative of nitrogen narcosis itself.