What is a key reason for using Enriched Air Nitrox instead of regular air for diving?

Using Enriched Air Nitrox, specifically gas mixtures that contain a higher percentage of oxygen than regular air (which is approximately 21% oxygen), is favored primarily for extending total bottom time and reducing decompression time. This is due to the lower levels of nitrogen in Enriched Air compared to regular air, which leads to a reduction in nitrogen absorption by the body.

When divers breathe a gas mixture with a higher oxygen content, they experience less nitrogen loading during their dive. This diminished nitrogen loading reduces the risks associated with nitrogen narcosis and decompression sickness since there is less nitrogen to off-gas during ascent. As a result, divers can enjoy longer dives while adhering to safe diving practices, allowing for extended exploration and greater enjoyment of underwater environments.

While the other options may seem appealing, they do not address the primary advantages of using Enriched Air Nitrox in a practical diving scenario. The potential for improved speed, cost reduction, or enhanced visibility is not directly linked to the use of Enriched Air Nitrox, making it essential to understand that the main benefit lies in the management of nitrogen exposure to enhance dive safety and duration.