The "Porpoise Class" refers to a category of submarines used by the Royal Navy. These submarines are designed for various roles, including training and research, and are known for their smaller size compared to larger classes. They are equipped with advanced technology to support their missions while maintaining a focus on efficiency and stealth. Porpoise Class submarines typically feature a streamlined hull and are powered by diesel-electric engines. They can operate in shallow waters and are often used for exercises that involve anti-submarine warfare. Their design allows for a versatile range of operations, making them valuable assets in naval strategy.