How is the dive profile planned differently when using EANx?

When diving with Enriched Air Nitrox (EANx), the dive profile is indeed planned for longer bottom times. This is primarily because EANx contains a higher percentage of oxygen compared to regular air, which allows divers to take advantage of reduced nitrogen absorption and, as a result, a lower risk of nitrogen narcosis and decompression sickness. Utilizing a gas mixture that includes more oxygen allows divers to extend their time at a given depth safely, provided they stay within the appropriate limits for the specific EANx mixture used.

This difference in planning stems from the understanding that as oxygen levels are increased, divers can sustain longer exposure times at depth without incurring the same level of nitrogen loading, allowing them to maximize their dive experience. However, one must also adhere to the specific depth limits associated with each EANx blend to avoid oxygen toxicity, which typically necessitates a careful review of dive tables or computer-based planning.

The other options introduce concepts that are not aligned with typical enriched air diving practices, such as unnecessarily extending safety stops or avoiding deep dives altogether, which aren't required if proper planning and guidelines are followed. Understanding these nuances helps divers effectively utilize EANx in their dive profiles.