What can occur if a diver ascends too quickly from depth?

Ascending too quickly from depth can lead to decompression sickness or barotrauma, which are serious conditions that affect divers. Decompression sickness, also known as "the bends," occurs when dissolved gases, primarily nitrogen, come out of solution and form bubbles within the body due to a rapid decrease in pressure. This can lead to various symptoms, ranging from joint pain and fatigue to more severe neurological or cardiovascular issues.

Barotrauma can occur as a result of rapid pressure changes affecting air-filled spaces in the body, such as the lungs or sinuses, which can lead to injuries. Both of these conditions underscore the importance of making slow and controlled ascents during diving to allow sufficient time for the body to equalize and for gases to safely exit the system.

The other choices do not relate to the physiological impacts of a rapid ascent. Enhanced visibility underwater and improved buoyancy control are not directly connected to ascent rates, and reduced fatigue during a dive does not occur as a result of ascending too quickly. Understanding these risks highlights why divers must adhere to safety protocols regarding ascent rates.