Which symptom may indicate a diver has experienced Nitrogen Narcosis?

Nitrogen narcosis, often referred to as "the rapture of the deep," occurs when a diver breathes nitrogen under high pressure, typically at depths greater than 30 meters (around 100 feet). One of the hallmark symptoms of nitrogen narcosis is the inability to concentrate.

This cognitive impairment arises because nitrogen can have an anesthetic effect on the central nervous system, impacting judgement and mental function. Divers may find themselves experiencing difficulty focusing, impaired decision-making, or a sense of euphoria that may lead them to take unnecessary risks.

Recognizing this symptom is crucial for divers, as it can lead to poor judgment and potentially dangerous situations underwater if not addressed. The other symptoms listed, while they can be associated with dive-related issues, are not as directly indicative of nitrogen narcosis specifically, making the inability to concentrate the most telling sign of this condition.