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Archaeologists exploring the world's largest flooded cave—discovered last month just outside of Tulum, Mexico—have found an impressive treasure trove of relics.
The vast, 216-mile cave actually connects two of the largest flooded cave systems in the world, the 164-mile-long Sistema Sac Actun and the 52-mile-long Dos Ojos system. Aside from an extensive reserve of freshwater and rich biodiversity, the cave also contains an 11-mile-long, 66-food-deep cavern dubbed "the mother of all cenotes." Cenotes are natural pits, or underwater sinkholes, that are often holy sites in ancient Mayan culture.