PADI Divemaster Certification Practice Exam

What should a diver do to prevent problems with dead air space?

1. Breathe rapidly and shallowly

2. Breathe slowly and deeply

3. Hold their breath continuously

4. Increase their ascent speed

The correct answer is: Breathe slowly and deeply

To prevent problems with dead air space, a diver should breathe slowly and deeply. Dead air space refers to the volume of air that is inhaled but does not participate in gas exchange, often due to improper positioning or equipment configuration. Shallow or rapid breathing can lead to inadequate ventilation, which means that the diver may not be effectively clearing carbon dioxide from their lungs, increasing the risk of divers experiencing discomfort or even hypoxia. By adopting a slow and deep breathing pattern, divers can ensure that they fill their lungs completely, which helps to exchange the air in their lungs more effectively. This enhances oxygen intake and ensures that carbon dioxide is expelled properly, minimizing the risks associated with dead air space. Additionally, deep breathing can also help reduce anxiety and promote relaxation underwater. Holding one's breath continuously would increase the risk of lung over-expansion injuries, while increasing ascent speed can lead to decompression sickness or other diving-related complications. Therefore, the recommended practice to prevent issues related to dead air space is indeed to breathe slowly and deeply.