After what depth does nitrogen absorption become particularly dangerous when using Nitrox?

The correct answer relates to the significant changes in nitrogen absorption dynamics as depth increases. At approximately 30 meters (100 feet), the partial pressure of nitrogen increases substantially, leading to higher nitrogen absorption by the body. This results in an elevated risk of nitrogen narcosis, which can impair judgment, coordination, and overall cognitive function.

While nitrogen can begin to have effects at shallower depths, particularly around 20 meters (66 feet), the risks become markedly more pronounced around 30 meters due to the higher pressures encountered. As divers approach this depth, it is crucial to recognize the potential for increased narcosis, necessitating careful planning and monitoring when utilizing Nitrox blends that are designed to mitigate some issues associated with nitrogen.