Where does the onset of Nitrogen Narcosis typically begin?

Nitrogen narcosis is a condition that occurs during diving, primarily due to the increased partial pressure of nitrogen at greater depths. The onset of nitrogen narcosis typically begins around a depth of 100 feet of seawater (fsw).

At this depth, the pressure increases significantly, which in turn increases the solubility of nitrogen in body tissues. Divers may begin to experience symptoms of narcosis, which can include impaired judgment, decreased motor skills, euphoria, and, in some cases, hallucinations or a sense of increased cognitive dysfunction.

While some divers may begin to feel effects at shallower depths, the consensus in diving medicine is that 100 fsw is where the effects become more pronounced and notable for most divers. It’s important for divers to be aware of this threshold to monitor their condition and make informed decisions about their diving practices, emphasizing safe ascent procedures if symptoms are noticed.