What physical symptoms might indicate a nitrogen narcosis incident?

Nitrogen narcosis, often referred to as "rapture of the deep," is a condition that can occur in divers due to the effects of increased nitrogen partial pressure at deeper depths. The correct symptoms associated with nitrogen narcosis include confusion and loss of coordination. These symptoms arise because nitrogen acts as an anesthetic at high pressures, affecting the central nervous system. This can lead to impaired judgment, difficulty concentrating, and compromised motor skills, making it challenging for divers to function effectively underwater.

The other options list symptoms that do not typically correlate with nitrogen narcosis. Visual disturbances and fainting, while concerning, align more closely with other conditions, such as decompression sickness or inadequate oxygen supply. Severe vomiting and chills may indicate other factors like hypothermia or illness rather than nitrogen narcosis. Similarly, sudden fatigue and extreme thirst are not classic indicators of narcosis but may suggest dehydration or fatigue from exertion. Understanding these symptoms is crucial for divers to recognize the condition and take prompt action to mitigate risks, such as ascending to shallower depths.