What consequence can occur from ascending too quickly?

Ascending too quickly can lead to decompression sickness, which is a serious condition that occurs when nitrogen bubbles form in the body's tissues and bloodstream due to rapid changes in pressure. As a diver descends, nitrogen is absorbed into the body’s tissues; if a diver ascends too quickly, the nitrogen doesn't have time to leave the body safely. Instead, it can form bubbles, causing various symptoms ranging from joint pain to more severe effects like paralysis or even death. This phenomenon emphasizes the importance of adhering to proper ascent rates and safety stops during dives to allow for the safe off-gassing of nitrogen.

The other potential consequences such as improved visibility, increased air consumption, and reduction in buoyancy are not directly related to the physiological impacts of rapid ascent.