Largest Underwater Cave Holds Mayan Secrets

A labyrinth of submerged caves in Mexico called Sac Actun is now the largest known underwater cave system in the world. 216 miles of caverns hold countless artifacts from the ancient Mayan civilization 10 to 12,000 years ago. Archaeologists have discovered Mayan ceramics, extinct animals, early humans, and Mayan graves, and the exploration’s just begun!

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