Deep in the lagoons of the Yucatán Peninsula lives the powerful and elusive Morelet's crocodile, which is crucial to the health of the local ecosystem. A group of Mexican scientists embarks on a nighttime venture to capture the reptiles and study their well-being. Although the crocodiles can navigate the dark lagoons with ease, the scientists have a hard time with the low visibility and dense mangroves—and the quick reflexes of their targets.