At what depth is nitrogen narcosis first noticed?

Nitrogen narcosis, often referred to as "the bends," typically begins to become noticeable at depths around 100 feet of seawater (FSW). At this depth, the partial pressure of nitrogen increases, affecting the central nervous system and leading to symptoms that can include euphoria, impaired judgment, and decreased motor coordination. This phenomenon is particularly relevant for divers because it can create a false sense of security, potentially leading to risky behavior.

While some divers may start to notice symptoms slightly earlier or later, 100 FSW is widely acknowledged as the threshold where nitrogen narcosis typically becomes a consideration in diving practices. The risks associated with nitrogen narcosis underscore the importance of proper training and depth awareness when engaging in deep-sea diving activities.