The "fosa de Calypso" is a deep underwater trench located in the Caribbean Sea. It is part of the larger Puerto Rico Trench, which is known for its significant depth and geological features. The trench reaches depths of over 8,000 meters, making it one of the deepest parts of the ocean. This trench is named after the Calypso, a research vessel used by the famous oceanographer Jacques Cousteau. The fosa de Calypso is important for scientific research, as it provides insights into marine ecosystems and the geological processes that shape the ocean floor.