Sistema Sac Actun, Subterranean river in Mexico
Sistema Sac Actun is one of the world's longest underwater cave systems.
The cave system's name means 'White Cave System' in Yucatec Maya language.
It holds significant cultural importance to the Maya civilization.
Diving in Sistema Sac Actun requires special training due to its complexity.
This cave system connects with the Dos Ojos system, forming a massive network.
Location: Tulum Municipality
Source: Wikimedia
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