Underground pits are often referred to as a variety of terms depending on their specific use or location. Synonyms for underground pit include subterranean pit, cellar, cavern, crypt, cave, shaft, tunnel, mine, and chasm. A subterranean pit is a depression in the ground that extends below the earth's surface. The cellar is an underground room often used for storage. A cavern is a naturally formed underground chamber, while a crypt is a room under a church, used for burial. A cave is a natural formation that extends below the surface of the earth. A shaft and tunnel are typically excavated for mining purposes, while a chasm is a deep, narrow gorge.