What is vital to ensure safety while diving with EANx?

Understanding the oxygen limits associated with different gas mixes is crucial for ensuring safety while diving with Enriched Air Nitrox (EANx). Each gas mix, particularly ones with higher oxygen content, has specific depth limits owing to the increased risk of oxygen toxicity. As divers go deeper, the partial pressure of oxygen increases and can reach levels that are hazardous to health.

By being aware of these oxygen limits, divers can plan their dives appropriately, ensuring that they stay within safe operational depths. This knowledge also helps divers manage their ascent rates and bottom times effectively to avoid oxygen toxicity and other potential health risks associated with diving with EANx.

The other options do not contribute to safety in the same critical manner. Diving deeper than previously experienced depths without understanding the associated risks could lead to dangerous situations. While taking breaks during a dive is beneficial for managing fatigue and decompression sickness risks, it does not directly address the specific hazards of oxygen toxicity. Using equipment without proper training can also lead to mistakes that could compromise safety underwater but is not as fundamentally related to the unique risks posed by the use of EANx.