Scuba Diving International (SDI) AFS 270 Practice Test

At the first sign of overexertion, which action is recommended?

Stop, relax and breathe deeply. Abort the dive. Signal to the shore or boat for assistance. Both the first and third answers are correct.

Correct Answer:

Stop, relax and breathe deeply.

Explanation:

When overexertion starts, the first move is to stop the exertion, rest, and breathe calmly. Stopping reduces the work your body has to do, easing the strain on your heart and lungs. Relaxing helps relieve chest tightness and tension, while slow, deep breaths improve oxygen delivery and help remove carbon dioxide, bringing your breathing and heart rate back under control. This immediate self-rescue step often prevents the problem from getting worse and lets you assess whether you can continue after you’ve recovered. Aborting the dive or signaling for help are options only if you can’t recover with rest or symptoms persist or worsen. So the best action is to stop, relax, and breathe deeply.

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