What is the primary benefit of using EANx in relation to dive planning?

The primary benefit of using Enriched Air Nitrox (EANx) in dive planning is that it allows for longer bottom times at given depths as compared to air. This is primarily due to the reduced percentage of nitrogen in EANx, which decreases the risk of nitrogen narcosis and allows for a lower overall nitrogen load in the diver's body.

When divers use EANx, they can enjoy extended periods underwater without exceeding the no-decompression limits, which makes it particularly advantageous for repetitive dives or dives to moderate depths. This extended bottom time is a key reason why many divers prefer to utilize EANx in their dive planning, as it increases their enjoyment and potential for exploration during dives without significantly increasing their risk of decompression sickness.

Other options, while they may touch on aspects of diving, do not capture the principal advantage associated with the use of EANx in dive planning. For instance, longer surface intervals are not a primary benefit; they tend to be necessary regardless of the breathing gas used if one is engaging in multiple dives. Similarly, shorter dive times contradict the benefit since EANx is intended to maximize time spent at depth. Finally, increased buoyancy is not a characteristic of EANx and does not relate to