What is the recommended way to recover from a nitrogen narcosis effect while diving?

Returning to shallower depths is the recommended way to recover from nitrogen narcosis because nitrogen narcosis occurs due to the increased partial pressure of nitrogen at depth. As a diver descends deeper, the symptoms of narcosis can intensify; therefore, ascending to a shallower depth reduces the pressure on the body, which allows the effects of the narcotic-like symptoms to dissipate quickly.

The onset of nitrogen narcosis can create various impairments, such as impaired judgment and decision-making. Ascending to shallower depths effectively lowers the pressure and helps restore cognitive function. It's important for divers to monitor themselves for symptoms of narcosis and take proactive measures, including ascending, if they experience signs of impairment.

In contrast, increasing ascent speed could lead to other dangers, including decompression sickness, while breathing pure oxygen at depth is not a standard practice and can be dangerous. Descending deeper into the water would only exacerbate the symptoms of narcosis. Thus, ascending to shallower depths is the safest and most effective response to nitrogen narcosis.