Editors’ note: This segment first appeared on Texas Monthly Presents, a television program airing on Texas PBS stations and on PBS.org. The state’s caving community is composed of fearless explorers—people who dare to go where no one has ever gone before. Hundreds of feet below the earth’s surface, in tight and dark tunnels, they help provide an illustration of our state that often goes overlooked. Distinguished writer Katy Vine takes us along for the ride in her story “Deep—Very, Very Deep—in the Heart of Texas,” detailing just how curious and courageous these cavers need to be.