Gas narcosis in scuba diving Narcosis in scuba diving, “gas narcosis” or “nitrogen narcosis”: this is the change in thinking and awareness, sensory and motor function and behaviour that occurs at depth.  Breathing gas at depth leads to narcosis, often noticed around 30m it can be an issue from around 20m and below.  Narcosis: a state of stupor, unconsciousness, or arrested activity produced by the influence of narcotics or … Continue reading Nitrogen narcosis in scuba diving and why we don’t call it that anymore