Scuba Diving International (SDI) Computer Nitrox Practice Exam 2025 – Comprehensive All-in-One Guide to Ace Your Certification!

Reaching the maximum operating depth is a critical moment for divers using Nitrox because it directly relates to the exposure to oxygen at higher pressures. Each Nitrox blend has a specific maximum operating depth determined by the partial pressure of oxygen it contains. Exceeding this depth increases the risk of oxygen toxicity, which can lead to serious health issues, including central nervous system (CNS) toxicity. Understanding and adhering to the maximum operating depth is essential for safe diving with Nitrox, as it ensures that divers remain within safe limits for the oxygen content in the gas they are breathing.

While making decisions to surface, performing equipment checks, or beginning the dive are important components of a safe diving operation, they do not carry the same immediate physiological risks associated with exceeding the maximum operating depth. Therefore, knowing and respecting this depth is fundamental to safe Nitrox diving.