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Where Is the World's Longest Underwater Cave?
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Quick Answer
Sistema Sac Actun on Mexico's Yucatán Peninsula stretches over 376 km.
The Full Story
Sistema Sac Actun, beneath the Yucatán Peninsula in Mexico, is the longest known underwater cave system, with over 376 km of surveyed passages. In 2018 explorers confirmed that it connects with the Dos Ojos system, merging them into one vast network. The cave features stunning crystal-clear water, stalactites, stalagmites, and archaeological remains including Mayan pottery and the bones of Ice Age animals. The system is a cenote-connected labyrinth carved through limestone by millennia of slightly acidic rainwater.
Key Facts
1.The cave contains some of the oldest human remains in the Americas, dating to over 13,000 years ago.
2.Cenotes — sinkholes connecting to the cave — were sacred to the ancient Maya.
3.The water visibility in parts of the cave exceeds 100 metres.
YouTube Angle
Suggested video title for this topic:
"Diving Into Sac Actun — The World's Longest Underwater Cave"