An underwater cave is a natural formation that occurs beneath the surface of water, often found in coastal areas or freshwater systems. These caves can be formed through the erosion of rock by water over thousands of years, creating intricate passageways and chambers. They are typically filled with water, which can vary in depth and clarity. Underwater caves are important ecosystems that support unique wildlife, including various species of fish, crustaceans, and microorganisms. They are also popular destinations for divers and researchers, who explore their depths to study geological formations and aquatic life. Safety precautions are essential when exploring these environments due to potential hazards.