The abseil down takes about 20 minutes. The cave definitely lives up to it's name - you really feel like you're entering a lost world abseiling down into this place. In the darker parts of the cave you can see the glowworms - little insect larvae sitting in the cave ceiling glowing with a strange blue light. Almost makes it look like a starry sky.. After hanging still glowing for half a year or more they turn into a little insect, mate, lay eggs and die within 2 or 3 days.