About 84,000 years ago, a massive volcanic eruption called los chocoyos ejected 270 cubic meters of ashes that can be found in rock strata as far as Florida and Panama. Locally, it formed a gigantic caldera which was later partially filled by water: and lake Atitlan was created. Filled by rain waters and surface streams, as the lake doesn’t discharge in any bodies of water, its level is regulated only by evaporation and drainage through cracks in the ground. This phenomenon makes the lake level quite variable, creating unexpected sights of half-flooded houses and trees. A complete contemporary village as well some antique Mayan cities were also swallowed by the lake, providing surreal diving opportunities.