Convoy of cargo ships is escorted to Gibraltar by Royal Navy warships.
Title reads: "Our lifeline across the Atlantic.
Convoy of cargo ships escorted across Atlantic Ocean to Gibraltar.
L/S of an aircraft carrier (either the Nairana or Vindex as the carrier is one of the ships converted from a merchant vessel) pan to a merchant ship which is lying astern of the carrier. M/S of a large cargo ship coming towards the camera in a rough sea and poor visibility. C/U of sailor using a telescope. C/U of officer on the bridge of the ship, camera pans around the bridge to the other members of the watch. M/S of sailors running along the deck of a warship to man the guns after the call to action stations.
Various C/Us of lookouts on board the warship, camera pans from one man to the next and they are all sweeping the sea with large, mounted binoculars. L/S of Rock of Gibraltar taken from the sea. High angled shot of sailors lined up on the deck of the ship, taken from the bridge, as the ship steams towards Gibraltar.