A D-Class submarine is a type of military submarine designed for various underwater operations. These submarines are typically used for reconnaissance, surveillance, and anti-submarine warfare. They are equipped with advanced sonar systems and torpedoes, allowing them to detect and engage enemy vessels effectively. D-Class submarines are known for their agility and stealth capabilities, making them difficult to detect. They often operate in groups, enhancing their effectiveness in naval missions. The design and technology of these submarines have evolved over time, reflecting advancements in naval warfare and underwater engineering, similar to other classes like the Virginia-class and Los Angeles-class submarines.