What can happen if a diver ascends too quickly during a decompression dive?

When a diver ascends too quickly during a decompression dive, the primary concern is related to the buildup of nitrogen in the body. During a dive, nitrogen from the breathing gas is absorbed into the tissues at a higher pressure. As a diver ascends, the pressure decreases, and if the ascent is too rapid, the nitrogen comes out of solution too quickly, leading to the formation of bubbles in the bloodstream and tissues. This process is what contributes to decompression sickness, also known as "the bends."

Proper ascent rates are critical to allow nitrogen to safely off-gas from the body. The controlled ascent allows for the gradual release of nitrogen, preventing excessive bubble formation, which can cause various symptoms ranging from joint pain to serious neurological issues.

The other options do not accurately describe the effects of a rapid ascent. Immediate loss of buoyancy can occur for various reasons, but it is not a direct consequence of ascending quickly. Furthermore, improved oxygen absorption and enhanced visibility underwater are unrelated to the dynamics of a rapid ascent and the physiological effects of nitrogen buildup.