Best use method of underwater aircraft: 1: Entering the water needs to be slow. After waiting for stable and uniform motion, the spoiler wing (AG6) can be abandoned 2: The jet engine needs to be ignited on the water, but before discarding the rocket, be sure to float up to get out of the water. Press ag7 and wait for 5 seconds before the rocket is automatically launched. Pay attention to the attitude of the aircraft and the nose rises slightly 3: Projectiles can cause rocket damage. 4: The machine gun can only work on the water surface, and the floating cannon can only work at a place higher than - 100m, and the collision will explode, resulting in the dispersion of other shells. In this case, please be sure to dive below 100m.