What is the primary benefit of increasing the oxygen percentage in the diving gas mix?

Increasing the oxygen percentage in the diving gas mix primarily benefits divers by lowering nitrogen content in the breathing gas. This reduction in nitrogen has a direct impact on nitrogen absorption during a dive, thereby decreasing the risk of nitrogen narcosis and improving the overall management of nitrogen loading.

By using a higher oxygen mix, divers are exposed to lower partial pressures of nitrogen, which helps mitigate the accumulated nitrogen in the body. This effect is particularly beneficial during longer dives or in environments where decompression sickness (DCS) could be a concern.

While other factors such as energy levels, safety, and visibility can be influenced by the diving environment or equipment, they do not primarily stem from adjustments made to the gas mix like the reduction of nitrogen does. Thus, the real advantage of increasing oxygen in the mix is centered around enhancing diver safety through better nitrogen management.