Virginia-class nuclear attack submarine (also known as Class 774) is the first nuclear submarine designed by the US Navy according to its ocean-going and offshore functions. It originated from the NSSN plan and is also a cheap solution to replace the sea wolf class submarine in the Cold War era. After the Virginia class is completed, it is expected to replace the Los Angeles class submarines, and it is planned to build 30 submarines. The first boat "Virginia" (SSN-774) started construction on 1998 and is expected to be completed and put into use in 2004. The US Navy plans to build 30 ships. Captain of this class 1 14.9 1 m, width 10.36 m, draft10./m, underwater displacement of 7800 tons, underwater speed of 34 knots, and diving depth of 488 m. Equipped with four 533mm torpedo tubes and 12 tomahawk cruise missile vertical tubes. The most advanced C4ISR combat system will be installed in the ship's electronic equipment. This class boat can launch the "Manta" recoverable autonomous unmanned submersible being developed by the US Navy for underwater reconnaissance, mine clearance and anti-submarine. You can also quickly deploy a 6-person "SEAL" commando team, equipped with your own ASDA small submarine, with a range of 125 nautical miles, which can directly dock with the "Virginia" class submarine. According to the data of the US Navy, the Virginia-class nuclear submarine with a cost of about $2.2 billion is the first submarine specially developed by the US military to deal with threats after the Cold War. It has powerful anti-submarine, anti-ship, long-range reconnaissance, special operations and the ability to accurately strike land targets with new Tomahawk cruise missiles. Compared with the "predecessors" who are mainly used to wait for a duel with enemy ships in the deep sea, the offshore combat capability of the "Virginia" class nuclear submarine equipped with automatic navigation control equipment is particularly prominent. The "Virginia" attack nuclear submarine is 377 feet long, with an underwater displacement of 7,800 tons, a diving depth of more than 800 feet and an underwater speed of 34 knots. During its whole life, there is no need to replenish nuclear fuel, and there are 132 officers and men on board. The Virginia class submarine has a 12 missile vertical launch system. The torpedo tube on the boat can launch Mk48 ADCAP heavy torpedoes and harpoon anti-ship missiles. The special operations module in the "Virginia" class submarine can also accommodate a miniature submarine for use by dozens of special forces. The optical fiber sensor replaces the old periscope and transmits the image of the surrounding environment to the computer screen of the command module. Therefore, the command module can be moved from the position below the periscope to a more spacious place on the lower deck. Developed countries: American name and model: "Virginia class" Developed units: Electric Ship Department of American General Dynamics Company, newport news Shipyard, etc.

[1] Cost: 2.2 billion dollars per ship on average.