This is the first submarine I built, named Northwest Wind. It is an imaginary nuclear submarine. The background of the submarine is based on the Chinese People's Liberation Army Navy. As an important force, submarines play an irreplaceable role in the Navy. After the end of World War II, the missile launching platform moved to the submarine, and the nuclear-powered submarine became an important part of the great power navy. The submarine has the advantages of sufficient firepower, fast speed and strong maneuverability. The following is a description of the control of the submarine. Action group 1: VTOL opens the rear missile silo, meat cutter missile, and Trim opens the periscope. Action group 2: Abandon the VTOL engine, VTOL and Pitch control the dive depth (Note: if the missile is dived too deep before launching the missile, it will fail). Action group 4 controls the front missile launcher and front missile. The ship's missile is cold-launched, and the launching missile does not need to float to the surface.