Which of the following is NOT part of the basic equipment for cavern diving?

In cavern diving, essential equipment is specifically tailored to meet the demands and safety requirements of confined underwater environments. A surface supply system is not part of the basic equipment, as this type of diving typically relies on individual tanks for air supply.

Cavern divers usually wear wetsuits to provide thermal protection, especially in cooler waters. Tanks are crucial as they supply the breathing gas necessary for diving. Dive lights are also fundamental since visibility can be significantly reduced in cavern environments. These items are designed to ensure diver safety and comfort. The surface supply system, while relevant in some diving scenarios (like commercial or saturation diving), is not standard for recreational cavern diving. Its complexity and requirement for a support team on the surface make it impractical for the typical cavern diving experience.