Sequence showing German intelligence officers studying maps, photos. Low AERIAL SHOT past lighthouse. CS of airgunner watching. AERIAL SHOT of rugged coastline. Shots of U-boats at sea, of crew, of wakes. Interior shots of German parachutists in training. Shots of German paratroops jumping from plane, floating down. Animated map of England's defenses. Various AIR TO AIR SHOTs of coastal patrol Sunderland flying boat flying above harbour, over water, over ship. CU of rear turret, of crewman signaling with light. Short sequence on destroyer and crew. Shots of mines being laid, of submarine net.