U.S. Navy submarines are advanced underwater vessels designed for various military missions, including surveillance, reconnaissance, and combat. They can operate stealthily beneath the ocean's surface, making them difficult to detect. The submarines are equipped with sophisticated technology, including sonar systems and missile launch capabilities, allowing them to engage in strategic operations. There are different classes of U.S. Navy submarines, such as Virginia-class and Ohio-class. Each class serves specific roles, with some focused on attack missions and others on ballistic missile defense. These submarines play a crucial role in maintaining national security and supporting naval operations worldwide.