PADI Divemaster Certification Practice Exam

If a diver remains within table or dive computer limits, what is the risk of decompression sickness?

1. Very high risk

2. Moderate risk

3. No risk

4. Unpredictable risk

The correct answer is: No risk

When a diver adheres strictly to the limits set forth by dive tables or a dive computer, the risk of decompression sickness is categorized as "no risk." This is because these tools are designed based on extensive research and data outlining safe ascent rates and time limits at specific depths. They account for factors such as nitrogen absorption, off-gassing, and the physiological responses of the human body under pressure. By following these calculated limits, divers significantly minimize the likelihood of excessive nitrogen accumulation in bodily tissues, which is the primary cause of decompression sickness. It’s vital for divers to recognize that if they follow recommended practices accurately and stay within the designated depth and time ranges, the chance of experiencing symptoms related to decompression sickness becomes negligible. However, it is important to remember that diving always comes with inherent risks, and there are scenarios beyond these limits when the risk may not be predictable, but under normal conditions with compliance to established protocols, the risk is effectively mitigated.