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Ox Bel Ha is the longest explored underwater cave system in the world. Located in Quintana Roo, Mexico, it measures a little over 150 miles in its underwater passages but also has within its system dry caves, making it the third largest in the world.
For scientists, Ox Bel Ha is every inch as mysterious, seductive and iconic as the countryâ€™s famous pyramids. In fact, an intrepid international team of divers and cave explorers have joined together to form theÂ Mexico Cave Exploration ProjectÂ (MCEP) to study Ox Bel Ha and the other underwater cave systems of Mexico.