Caving · Waitomo, North IslandBlack Abyss caving & abseiling, WaitomoADVANCEDRisk: HIGHNZD ~280–320Beyond the glowworm boat rides sold to tourists, the "Black Abyss" route drops you down a 35m abseil into the Ruakuri cave system, then out through flooded passages via tubing, climbing and a final waterfall abseil — several hours underground with genuine vertical and water commitment.View details