What type of first aid knowledge should cavern divers possess?

Cavern divers should possess knowledge of recognizing signs of decompression sickness and administering basic first aid and CPR techniques because these skills are essential in managing emergencies that may arise during diving activities. Decompression sickness, also known as "the bends," can occur when divers ascend too quickly, leading to nitrogen bubbles forming in the body. Understanding the symptoms, such as joint pain, fatigue, or difficulty breathing, allows divers to act swiftly and seek appropriate medical help.

Moreover, being trained in basic first aid and CPR ensures that divers can respond effectively to various situations, including potential drowning incidents or injuries sustained during a dive. This foundational knowledge creates a safer diving environment, as divers are equipped to handle emergencies until professional medical assistance can be reached.

In contrast, while advanced life support and emergency evacuation procedures are valuable, they may not be as critical for every cavern diver. Surface first aid practices alone do not cover the unique challenges faced underwater, and while awareness of underwater rescue techniques is beneficial, it may not be as comprehensive or essential as understanding the signs of decompression sickness and basic first aid measures. Thus, the emphasis on recognizing decompression issues and being able to perform first aid and CPR makes this option the most pertinent for cavern divers.