tarkin and vader watch the computer projected screen with interest, as a circle of lights intertwines around one another on the screen showing it's position in relation to yavin and the forth moon. alarm sirens scream as soldiers scramble to large turbo- powered laser gun emplacements. electronic drivers rotate the huge guns into position as crew adjust their targeting devices. technical crews scurry here and there loading last-minute armaments and unlocking power cables. walls buckle and cave in. troops and equipment are blown in all directions. stormtroopers stagger out of the rubble. standing in the middle of the chaos, a vision of calm and foreboding, is darth vader. one of his astro-officers rushes up to him. smoke belches from the giant laser guns as they wind up their turbine generators to create sufficient power. the crew rushes about preparing for another blast. even the troopers head gear is not adequate to protect them from the overwhelming noise of the monstrous weapon. one troopers bangs his helmet with his hand in an attempt to stop the ringing. the thunder and smoke of the big guns reverberate throughout the massive structure. many soldiers rush about in the smoke and chaos, silhouetted by the almost continual flash of explosions. imperial star pilots dash in unison to a line of small auxiliary hatches that lead to imperial tie fighters. darth vader strides purposefully down a death star corridor, flanked by imperial stormtroopers. an armed imperial stormtrooper is knocked to the floor from the attack explosion. other troopers scurrying about the corridors are knocked against the wall and lose their balance. grand moff tarkin casts a sinister eye at the computer screen. an imperial soldier runs to the control panel board and pulls the attack lever as the board behind him lights up. several imperial soldiers, flanking a pensive grand moff tarkin, busily push control levers and buttons.