SDI Open Water Scuba Diver Practice Exam

What does the term "safety stop" refer to in scuba diving?

1. A pause at shallow depth during ascent

2. A technique to avoid nitrogen buildup

3. A method for checking equipment

4. A dive technique for beginners

The correct answer is: A pause at shallow depth during ascent

The term "safety stop" refers to a pause made at a shallow depth during ascent, typically at around 15 to 20 feet (5 to 6 meters). This practice is crucial because it allows divers to off-gas excess nitrogen absorbed in their bodies during the dive. Ascending too quickly can lead to decompression sickness, commonly known as "the bends," which can occur if nitrogen bubbles form in the body due to rapid pressure changes. By incorporating a safety stop, divers give their bodies additional time to eliminate nitrogen safely, significantly reducing the risk of adverse effects associated with rapid ascents. While other options mention relevant concepts to diving and safety, they do not accurately define what a safety stop specifically entails. For instance, while avoiding nitrogen buildup is important, the safety stop itself is a practical application of that concept, rather than a standalone technique. Checking equipment is an essential part of diving safety, but it does not describe the safety stop. Lastly, although the safety stop can benefit divers of all experience levels, it is not exclusively a method for beginners, as experienced divers employ this technique during every dive.