--Oluchi, to Sheva and Josh regarding the tribesman and women of the African caves. Silent Caverns (Also known as the Caves of Silence, Mouth of the Devil, the Labyrinth, Caves of No Return, etc.) are a large group of labyrinthine caves situated far outside of the village of East Zahani. The caves consist primarily of thick, aged limestone strata capped by a layer of sandstone, making the ancient structures remarkably stable, even in the passing centuries of heavy rainfall. Though not completely explored, it is believed to include more than 700 miles of passageway.