I bet you didn't know they could do that did you? In this video we have what appears to be an F-6 or some such jet fighter launching from a submarine like an ICBM would. However, it is pretty simple to see that the video has been doctored. The actual missile that is launched in the video is pretty small and easily concealed by the plane in front of it. The fighter itself is probably 3D object. If you notice when it first leaves the water there is no water around the wings and the shape of the water spout doesn't match the jet. Next mistake is when they roll the plane to make it look like it is an actual jet and not just a missile the exhaust doesn't change. The exhaust stays constant but if it had really rolled it would have changed (not to mention that there are two engines on the back of the yet). They might have had better luck with an F-15 and some added partical effects around the exit from the ocean.