Scuba Diving International (SDI) Computer Nitrox Practice Exam

What equipment is necessary for safe decompression diving?

1. Standard buoyancy control device

2. Specialized dive computers

3. Additional gas supply tanks

4. None of the above

The correct answer is: Additional gas supply tanks

In the context of safe decompression diving, having an additional gas supply tank is essential for managing the proper gas mix required for safe ascent and decompression stops. Decompression diving involves ascending slowly and making specific stops at various depths to allow excess nitrogen absorbed during the dive to be released from the body safely. This process often necessitates using different gas mixes, frequently enriched air nitrox or even trimix, particularly when diving at deeper depths. Having an additional gas supply tank ensures that divers have access to the appropriate gas mix during decompression, allowing them to effectively manage their nitrogen loading and reduce the risk of decompression sickness. This is crucial as the wrong gas mix or insufficient gas supply can compromise safety during these critical phases of the dive. While a buoyancy control device and specialized dive computers can greatly enhance the safety and effectiveness of a dive, they do not solely address the specific needs for managing gas supply during decompression. Thus, while they are important, the additional gas supply tanks specifically fulfill the requirements for safe decompression.