Casa del Mundo is a boat-access Lake Atitlán dive on steep volcanic shoreline where the lake meets the hotel's submerged lower levels. Divers move between cliff walls, drowned dock sections, and rocky lake-bottom terrain instead of a coral reef. The route is best treated as a controlled freshwater dive with altitude, cool water, and visibility that can tighten after rain. It suits slow scenic exploration more than current or blue-water drift.