"Sanshikidan (???, "type 3 shell") was a form of ammunition: a World War II-era combined shrapnel and incendiary anti-aircraft round used by the Imperial Japanese Navy. The type of layered construction of the warheads were generically referred to as Beehive rounds. The shells were intended to put up a barrage of flame that any aircraft attempting to attack would have to navigate through. However, U.S. pilots considered these shells to be more of a pyrotechnics display than a competent anti-aircraft weapon." -Wiki. . Press 5 and fire the machine guns, it should cause the gun to explode. Now restart and press 1 to launch the shell, press 5 to detonate it. Press two to launch the second and press 6 to detonate it. You know how to use the third shot.