Within the Mexican island of Cozumel there winds an underwater cave system called Cueva Quebrada, in which a significant cache of Mayan artifacts lies, mysteriously, almost a mile from any of its entrances. But how?Within the Mexican island of Cozumel there winds an underwater cave system called Cueva Quebrada, in which a significant cache of Mayan artifacts lies, mysteriously, almost a mile from any of its entrances. But how?