The word ‘Unknown World’ always leads us to the curiosity but also to the nameless anxiety. For the spelunkers who are crazy about the narrowest passage where you should squeeze your body to pass and the dark and humid caves, the assumption that the two caves in New Zealand, the Nettlebed and the Stormy Pot might be connected is a temptation that you could never give up. The temptation gets only bigger as it would make you the first discoverer of the unknown connecting passage of 80 meters between the two caves. The cave expedition put the first step with the wildest dream in mind. Can their reckless challenge succeed?