Which condition results from a rapid ascent without proper precautions?

A rapid ascent without proper precautions can lead to an air embolism. During a dive, as a diver descends, the pressure increases, and nitrogen dissolves into the body's tissues and bloodstream. When a diver ascends too quickly, the dissolved gases can form bubbles in the blood vessels. If these bubbles enter the bloodstream, they can travel to the brain or other organs, causing serious complications, which is referred to as air embolism.

Understanding this phenomenon is critical for divers because it emphasizes the importance of controlled ascents and following safety protocols, such as using a dive computer or following a safety stop. Awareness and education on this topic are vital for preventing potentially life-threatening situations during diving activities.