What is one common sign of nitrogen narcosis?

Nitrogen narcosis, often described as a form of "rapture of the deep," typically occurs when divers descend to depths greater than 30 meters (about 100 feet). One of the most prominent signs of this condition is confusion or impaired judgment. This happens because nitrogen, which makes up a significant portion of the air we breathe, can have a narcotic effect on the central nervous system at increased pressures. This altered state can lead to a feeling of euphoria, disorientation, and difficulty with decision-making, which can compromise a diver's ability to respond to their environment and follow safety protocols.

While the other options refer to potential symptoms that might occur in various diving situations or other medical conditions, confusion or impaired judgment is directly associated with the specific neurological effects of nitrogen narcosis, making it the most relevant sign. Understanding these signs is crucial for divers to recognize this condition and take appropriate action, such as ascending to shallower depths if symptoms occur.