Attack on a German U-Boat: AIR TO AIR shot of a PBY Catalina with convoy in lower background. AERIAL SHOT of whole convoy, many ships. LS of U-Boat on surface. Sequence on US carrier planes taking off. AIR TO AIR shot of squadron of US Douglas SBD-3 Dauntless dive bombers in flight. Gun camera sequence of scratched shots of U-Boat being strafed, bombed.