Scuba Diving International (SDI) Computer Nitrox Practice Exam

What is a potential consequence of using a Nitrox mixture not aligned with dive plans?

1. Reduced air consumption

2. Improved buoyancy control

3. Increased risk of decompression issues

4. Enhanced visibility underwater

The correct answer is: Increased risk of decompression issues

Using a Nitrox mixture that is not aligned with dive plans can lead to an increased risk of decompression issues. This is primarily because different Nitrox mixtures have varying levels of oxygen and nitrogen content, which directly affects the way nitrogen is absorbed and eliminated by the body during a dive. If a diver uses a Nitrox mix that has a higher oxygen content than planned for the dive profile, the diver may exceed recommended limits for oxygen exposure, leading to potential oxygen toxicity. Conversely, using a mix that is too rich in nitrogen can lead to greater nitrogen absorption, increasing the risk of decompression sickness when surfacing. Therefore, adhering to the planned Nitrox mixture is crucial for managing nitrogen loading and ensuring safe ascent profiles, minimizing the risk of decompression issues during and after the dive. Understanding the specific mixture and its implications is essential for safe diving practices.