Within the rugged mountains of Oaxaca, Mexico is Sistema Huautla- an underground abyss that redefines the scale of the subterranean world beneath us.  Explored to a depth of -1560 meters, it is the deepest known cave in the Western Hemisphere and tied with a cave in Austria as the 9th deepest in the world. Currently, Sistema Huautla includes 29 separate entrances, with their respective caves totaling 55 miles of passage.  As the immensity of this underground wilderness is still not fully realized, exploration in Sistema Huautla is on-going.