| 11. | Between the two ridges there are hidden valleys, draining into cave systems.
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| 12. | The expedition achieved a world record push of into the cave system.
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| 13. | They discover a huge, complicated cave system, with many animals and people.
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| 14. | Thien Cung and Dau Go are remnants of the same old cave system.
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| 15. | Cacahuamilpa is one of the largest cave systems in the world.
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| 16. | The cave system is connected to the legend of King Arthur.
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| 17. | Approximately 60 % of the cave system is not regularly explored.
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| 18. | The cave system is formed within the Middle Limestone of the Yoredale Series.
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| 19. | Cave murals can be found in the partially submerged cave system.
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| 20. | The cave system is believed to extend further, but has not been explored.
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