In this July 28, 2016 photo, Pedro Mamani prepares food inside a mountain cavern near San Pedro de Colalao, Argentina's northern province of Tucuman. Luca has lived in a cave in northern Argentina for 40 years. The 79-year-old man has survived without running water and electricity in his cavern high up in a mountain in northern Tucuman province. (AP Photo/Alvaro Medina)