But the ship now in the crosswires was not the Belgrano. This was August, almost two months after the liberation of the Falklands, and on the other side of the world, in the Barents Sea, backyard of the mighty Soviet Northern Fleet. Conqueror was sailing as close to Russian territorial waters as was legally allowed – or maybe closer. Submariners, a tight-knit community, politely disdainful of their surface counterparts, joke that there are two types of naval vessel: submarines and targets. Wreford-Brown’s target was a spy trawler – an AGI in Nato parlance, meaning Auxiliary General Intelligence. Crammed with interception and detection equipment, they were a ubiquitous presence during the Cold War, shadowing Nato exercises or loitering off naval bases.