Which of the following is a sign of nitrogen narcosis during a dive?

Nitrogen narcosis, often referred to as "rapture of the deep," occurs when divers are exposed to increased levels of nitrogen under pressure, typically at depths greater than 30 meters (100 feet). One of the hallmark signs of this condition is an overwhelming sense of euphoria or relaxation. Divers experiencing nitrogen narcosis may feel unusually calm, carefree, or even overly confident, which can impair their judgment and decision-making abilities.

This feeling of euphoria can lead to risky behaviors, as divers might not fully recognize the potential hazards of their altered state. It's crucial for divers to understand this sign, as recognizing feelings of excessive relaxation can help them identify when they may be experiencing narcosis and take appropriate action, such as ascending to a shallower depth where the effects may diminish.

Signs like increased power of speech, heightened senses, or increased heart rate are not typically associated with nitrogen narcosis and may suggest other physiological responses or conditions instead.