Sea power: MS of freighter sailing, other freighters in the distance. Shots of German U-boat leaving port. Two shots of camouflaged destroyer patrolling. LS of periscope slicing through water. Shot of freighter at sea. Interior HAS of boiler room, feverish activity. Shot of torpedo trail. LS of explosion and of sinking of freighter. Shot of destroyers laying smoke screens, submarine surfacing. Staged sequence on freighter opening fire with deck gun intercut with LSs of submarine being hit, crew cheering as, presumably, submarine is sunk. HAS of German crews being taken aboard camera ship. BOATING SHOT past flotilla of captured German submarines at scapa flow. Shot of Admiral Beatty and King George V strolling on deck of ship.