Subterrane is a term that refers to something that is located underground or beneath the surface of the earth. It can be used to describe caves, tunnels, and other underground structures. The crossword solution for the term SUBTERRANE is CAVE, which is a type of subterrane structure. Caves are natural underground openings that are formed by erosion or other geological processes. They can be found in many different types of terrain, from mountains to deserts. Caves provide shelter and refuge for many animals and plants, and they are also popular tourist attractions.