The hit sphere doesnt move.... at all so you could have evil stealth flying submarines of dEWM..!

As you can see there the hitsphere most certainly doesnt move...
Also Von, its clear you have the missile model come out of a small tube and then move up to the surface accompanied by water graphical effects.. once this piece moves to the surface the script calls aiming ready and the weapon then can actually fire from that spot.. or some variation of that part..