What is the appropriate corrective measure for a diver experiencing cold during a dive?

When a diver experiences cold during a dive, notifying the dive supervisor immediately is a vital corrective measure. The dive supervisor holds overall responsibility for the safety and well-being of the diving team. By notifying them, the diver ensures that appropriate actions can be taken based on the severity of the situation. This could include returning to the surface, providing additional thermal protection, or organizing assistance for the diver.

While increasing airflow in the suit may temporarily relieve cold discomfort, it does not address the underlying issue directly and could lead to additional complications. Adjusting the water temperature is often not feasible during a dive, as divers cannot change environmental conditions. Reassessing the buddy's support is important in general diving safety but does not directly resolve the immediate concern of the diver experiencing cold. Thus, engaging the dive supervisor for further assessment and support is the most effective course of action.