What should a diver do during an uncontrolled ascent?

During an uncontrolled ascent, the best course of action is to perform a controlled descent and avoid panic. This approach is essential because it helps the diver manage the situation effectively and mitigate risks associated with rapid ascents, such as pulmonary barotrauma or decompression sickness.

If a diver finds themselves ascending uncontrollably, remaining calm is crucial. Panic can lead to erratic movements or poor decision-making, potentially worsening the situation. By focusing on performing a controlled descent, the diver can actively monitor their buoyancy and use any available means to stabilize their ascent, such as exhaling to reduce pressure in their lungs or making slight adjustments to their buoyancy control device. This proactive response helps to regain control of the ascent and ensures the safety of the diver.

The other choices involve actions that do not effectively address the urgency and risks associated with an uncontrolled ascent. For instance, continuing to ascend rapidly is dangerous and contradicts the fundamental principles of safe diving practices. Similarly, using an anchor line to stabilize ascent may not be feasible in all situations, and deploying a surface marker buoy is a signal for help rather than a technique to manage the ascent itself. Hence, prioritizing a controlled descent while maintaining composure is the most effective strategy in this scenario.