These eerie yet magical photographs show part of a worshipped Mayan world—a glimpse into the world’s longest underwater cave systems. Formed millions of years ago during the ice ages, these rare images show cenotes at the Rivera Maya in Mexico. Photographer and diver Martin Broen, from New York, captured these incredible scenes when diving in more than 60 different caves located between Playa del Carmen and Tulum. Describing it like floating through a different planet, the natural swimming holes were formed by the collapse of porous limestone bedrock, leaving a secret world of groundwater pools. The “sacred wells” were celebrated by the Mayans, but were also used as a place for human sacrifice by some. Martin decided to explore the cenotes to try and capture their hidden beauty, which is often dismissed by divers as a lifeless place. “For many years I [have] been trying to capture the beauty and …