Underworld Rafting is a cave rafting adventure in the Paparoa National Park. You will take the rainforest train through the primeval rain forest and explore a calcitic paradise of stalatites and stalagmites in one of NZ’s largest caves systems. You will float through incredible glow-worm lit grottoes in the bottom levels of the cave and complete the underworld experience having fun bouncing down the small Nile River rapids.