PADI Divemaster Certification Practice Exam

What is the primary concern regarding out-of-air situations during deep dives?

1. Divers typically use gas slower at shallower depths

2. Divers use gas faster at deeper depths

3. Divers can easily share air

4. Divers need to hold their breath longer

The correct answer is: Divers use gas faster at deeper depths

The primary concern regarding out-of-air situations during deep dives stems from the physiological effects of depth on gas consumption. As a diver descends, the pressure increases, which causes the density of the breathing gas to also increase. This greater density can lead to higher respiratory rates and consumption of air, meaning that at deeper depths, a diver may deplete their air supply much more quickly compared to shallower dives. Therefore, understanding that divers use gas faster at deeper depths is critical for dive planning and safety. This knowledge emphasizes the importance of monitoring air supply closely, having contingency plans for potential out-of-air situations, and ensuring that divers maintain adequate gas reserves for the duration of their dive, particularly when exploring deeper environments. Additionally, the physiological risks associated with deep diving, such as narcosis or the need for more frequent ascent stops, can compound the danger of running low on air.