A Fast Attack Submarine is a type of military submarine designed for quick and agile operations. These submarines are primarily used for anti-submarine warfare, intelligence gathering, and surveillance missions. They are equipped with advanced sonar systems and torpedoes, allowing them to detect and engage enemy vessels effectively. Fast attack submarines are typically nuclear-powered, which gives them the ability to operate underwater for extended periods without surfacing. This capability enhances their stealth and makes them difficult to detect. Notable examples include the Los Angeles-class and Virginia-class submarines used by the United States Navy.