Battle of the Atlantic: shot of convoy at sea. Various views of short Sunderland flying-boat - bombs, rear gunner, flying-boat taking off. Interior shot of Sunderland in flight, pilots' quarters. Several shots of interior of Sunderland flying-boat in flight, crew cooking dinner. AERIAL SHOTs of convoy, rough sea. Shots of convoy in port, Sunderland landing, unloading of convoy. Shot of meeting of convoy captains. Views of loading, of convoy on the way. AERIAL SHOT of the sea. Flight of Sunderlands. AIR TO AIR shot of Sunderland in flight.