| 21. | The cave system is believed to extend further, but has not been explored.
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| 22. | The cave system is formed within the Middle Limestone of the Yoredale Series.
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| 23. | Cave murals can be found in the partially submerged cave system.
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| 24. | Thien Cung and Dau Go are remnants of the same old cave system.
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| 25. | Approximately 60 % of the cave system is not regularly explored.
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| 26. | The cave system is connected to the legend of King Arthur.
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| 27. | Cacahuamilpa is one of the largest cave systems in the world.
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| 28. | But most of the cave systems were much less extensive.
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| 29. | Calcite rafts are most commonly formed in limestone cave systems.
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| 30. | Subterranean rivers may be entirely natural, flowing through cave systems.
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