This picture shows the Atlantic Conveyor being readied for its long journey to the South Atlantic. It was fitted out with defences and machine guns but it became a target of an exocet missile. The Argentinians assumed by its large size on their radar screens that it was an aircraft carrier. Its loss was a severe blow anyhow for the British as she carried vital supplies for the campaign.
In this picture you can see Torpoint in the background with the ferry operating.
Empire in Your Backyard: Plymouth Article