In terms of equipment, what condition must EANx divers ensure for their gear?

For EANx divers, ensuring that all gear is free of oil and contaminants that might react with oxygen is essential for safety. This is crucial because oxygen can be a reactive substance, especially at higher concentrations, as found in enriched air nitrox. Substances like oils and other contaminants can ignite or degrade when exposed to elevated oxygen levels, posing a significant risk of fire or equipment failure.

By maintaining gear that is clean and devoid of potentially reactive contaminants, divers can greatly reduce the risk of accidents. This practice is part of standard safety protocols in diving with enriched air, as it safeguards both the equipment's integrity and the diver's safety.

Other options, while they may seem relevant, do not align with the critical safety requirements for EANx diving. For example, the visibility of gear is important but does not specifically address the unique hazards associated with higher oxygen environments. Regular servicing is good practice but not necessary for every single dive, and using new and unused gear every time isn't practical or typically required in diving scenarios. Therefore, maintaining contamiant-free equipment is the most important condition for EANx divers.