Tunnelings refer to the act of constructing an underground passage or digging through a place that is solid or densely packed. Synonyms for tunnelings include burrowing, excavation, digging, boring, and subterranean channeling. Many of these words emphasize the act of digging or making a hole, while others focus on the end result of creating a passageway. Other synonyms for tunnelings include subways, mines, catacombs, and caves. These words highlight different contexts and types of underground spaces, but they all share the common element of being located beneath the surface. Whether one is speaking of the tunnels of a subway system or the burrowings of a small animal, tunnelings evoke a sense of exploration and discovery.