Black water rafting is an adventure activity that involves floating through underground rivers in caves, often in complete darkness. Participants wear wetsuits and helmets while navigating the water on inflatable tubes. The experience typically includes stunning rock formations and unique cave ecosystems. This activity is popular in regions with limestone caves, such as Waitomo in New Zealand. Tours are usually guided, ensuring safety and providing insights into the cave's geology and wildlife. Adventurers may also encounter glowworms, which create a magical ambiance in the dark waters.