At the southeastern base of Deacon Peak, a crevasse in the rocks reveals the water-filled opening of a cave. Divers have descended to over 400 feet yet still have not discovered the cavern’s bottom. The water temperatures at the surface register a constant 92° F. Just below the water surface on the south end of the cave opening lying about one foot underneath is a rock shelf. The shelf measures 11.5 by 16.6 feet with the pool above measuring 11.5 by 42 feet. Welcome to the world of the Devils Hole pupfish – Cyprinodon diabolis.