The city of Tulum in the state of Quintana Roo in Mexico is surrounded by more than 800 kilometres of mapped cave passage.
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NaharonA tannic fresh water cap sits undisturbed high in this dome and is an eerily fascinating cave feature.
Mapping caves Diver propulsion vehicles (DPVs) and knotted line are useful tools for a cave diver who is mapping caves.
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Underwater
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