Representative image Submarines are among the most advanced and mysterious machines ever built. Designed to operate beneath the surface of the sea for extended periods, submarines play a major role in military defense, scientific exploration, underwater rescue, intelligence gathering, and even tourism. Their ability to travel unseen, strike unexpectedly, and survive in hostile environments makes them one of the most strategic assets in modern naval warfare. Over time, submarines have evolved from small hand-powered vessels into highly sophisticated machines powered by nuclear reactors and advanced batteries.There are many types of submarines, each designed for a specific purpose. Some are meant…