Full title reads: "Naval Intelligence".
Very good shots of large convoy of merchant ships steaming across calm sea with British destroyer escort, good shots showing the long lines of ships in an Atlantic convoy and the destroyer escort steaming past, also shots of seaman on the merchant ships...
Armed merchant cruiser 'Carnarvon Castle' arrives at Montevideo harbour for repairs.
Merchant sailors being adrift for a month finally saved by Belgian destroyer.
Trials are made to use Sikorsky helicopters as U-boat killers.
Footage of large Merchant ship being fitted with an anti submarine gun.
Footage of French Contraband officers boarding merchant ship on the Mediterranean.
Queen of Merchant Navy crowned at Islington.
Aerial shots of ships at sea as Spitfires and Mosquitos fly over coast.
Shots of the ship 'San Fraterno'.