So clear are the steaming pools that to stare down into them is like staring down into a cave that leads to the earth's core.

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For an unforgettable experience, take a night walk to the arched cave and waterfall at Natural Bridge under the western ramparts of the Springbrook plateau, which is alight with fairy-like blue-green lights given off by the millions of bioluminescent glow worms that line the cave roof and the steep earth banks along the rainforest path.

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In the 1980s he stumbled across an opening in the earth that was 50 meters in diameter and realized this was no ordinary cave.

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The caving crew descends through tight passages hundreds of feet beneath the Earth's surface, guided by the gust of air that marks the cave's primary passage.

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The dripping of water resonates around the cave, and I'm reminded of Axel's words in Journey to the Centre of the Earth: 'I had not yet peered into the fathomless pit into which I was about to venture.

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