Why might a diver choose EAN36 over EAN32?

Choosing EAN36 (Enriched Air Nitrox with 36% oxygen) over EAN32 (with 32% oxygen) primarily relates to the management of bottom time at shallower depths. When diving with nitrox, higher concentrations of oxygen provide advantages, particularly in terms of extended no-decompression limits.

At shallower depths, the effect of nitrogen narcosis is reduced, and since the diver is breathing a mix with a higher percentage of oxygen, they are able to utilize that increased oxygen partial pressure to enhance the bottom time safely. This is due to the reduced nitrogen loading that occurs when using nitrox, compared to standard air. The lower nitrogen levels result in less cumulative nitrogen absorption which translates into longer permissible dive times without the risk of decompression sickness.

This choice of EAN36 allows divers to maximize their bottom time and explore more while safely managing their ascent profiles and surface intervals according to the no-decompression limits, making it a favorable option for many divers engaged in recreational diving at shallower depths.