Learn what Maximum Operating Depth means, how MOD is calculated from oxygen percentage and PPO2 limits, and how to apply it in real dive planning.

Learn what Nitrox is, how enriched air works, its benefits and risks, and why divers choose it.

Learn what Surface Air Consumption rate is, how to calculate it, and tips to improve your breathing efficiency underwater.

Understand partial pressure of oxygen limits, oxygen toxicity risks, and how to stay safe at depth.

Understand the difference between SAC rate and RMV, when to use each metric, and how to convert between them.