The term 'Distance Below the Surface' can be summarized as the DEPTH of something below the surface. This term is often used to describe the distance between the surface of the Earth and a certain point, such as the bottom of a lake or ocean. It can also be used to describe the distance between the surface of an object and a certain point, such as the center of a planet or star. In a crossword puzzle, the term 'DEPTH' (5 letters) is often used to represent this concept.